|
| clock = Up to 4.5 GHz
<!--------- Products, models, variants ----------->
| pcode1 = SKL
| brand1 = {{unbulleted list|Core i3|Core i5|Core i7|Core i9|Core m3|Core m5|Core m7|Xeon|Celeron|Pentium}}
<!------------------ History ------------------->
}}
'''Skylake'''<ref name=software.intel.com>{{cite web|url=https://software.intel.com/sites/default/files/managed/c5/9a/The-Compute-Architecture-of-Intel-Processor-Graphics-Gen9-v1d0.pdf|title=The Compute Architecture of Intel® Processor Graphics Gen9|website=Software.intel.com|access-date=January 24, 2018}}</ref><ref>{{cite web|url=http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-optimization-manual.pdf|title=Intel® 64 and IA-32 Architectures Optimization Reference Manual|website=Intel.com|access-date=January 24, 2018}}</ref> is the [[List of Intel codenames|codename used by Intel]] for a processor [[microarchitecture]] that was launched in August 2015<ref>{{cite web |title=Chip Shot: Intel Unleashes Next-Gen Enthusiast Desktop PC Platform at Gamescom |url=http://newsroom.intel.com/community/intel_newsroom/blog/2015/08/05/chip-shot-intel-unleashes-next-gen-enthusiast-desktop-pc-platform-at-gamescom |website=Intel Newsroom |date=August 5, 2015 |access-date=August 5, 2015}}</ref> succeeding the [[Broadwell (microarchitecture)|Broadwell]] microarchitecture.<ref name=codenames>{{cite web |last1=Demerjian |first1=Charlie |date=March 31, 2011 |title=After Intel's Haswell comes Broadwell |url=http://semiaccurate.com/2011/03/31/after-intels-haswell-comes-broadwell-sk/ |website=Semi Accurate |access-date=January 4, 2012}}</ref> Skylake is a microarchitecture redesign using the same [[14 nanometer|14 nm]] [[Semiconductor device fabrication|manufacturing process technology]]<ref>{{cite web |title=Intel Presentation: 22nm Details |url=http://download.intel.com/newsroom/kits/22nm/pdfs/22nm-Details_Presentation.pdf |website=Intel |date=May 2011 |access-date=January 4, 2012}}</ref> as its predecessor, serving as a tock in Intel's [[Tick–tock model|tick–tock]] manufacturing and design model. According to Intel, the redesign brings greater CPU and [[GPU]] performance and reduced power consumption. Skylake CPUs share their microarchitecture with [[Kaby Lake]], [[Coffee Lake]], [[Cannon Lake (microarchitecture)|Cannon Lake]], [[Whiskey Lake (microarchitecture)|Whiskey Lake]], and [[Comet Lake]] CPUs.
Skylake is the last Intel platform on which Windows earlier than [[Windows 10]] will be officially supported by [[Microsoft]],<ref name=techradar>{{cite web|url=http://www.techradar.com/news/software/operating-systems/intel-s-latest-cpus-will-only-support-windows-10-1327487|title=Intel's latest CPUs will only support Windows 10|publisher=Tech Radar|author=Darren Allan |date=31 Aug 2016|access-date=8 Jun 2017}}</ref> although enthusiast-created [[modding|modifications]] exist that allow [[Windows 8.1]] and earlier to continue to receive [[Windows Update]]s on later platforms.<ref>{{Cite web |last1=Merriman |first1=Chris |date=April 19, 2017 |title=There's a patch to reinstate Windows 7 & 8.1 on Kaby Lake CPUs |url=https://www.theinquirer.net/inquirer/news/3008609/theres-a-patch-to-reinstate-windows-7-81-on-kaby-lake-cpus |archive-url=https://web.archive.org/web/20170420134648/https://www.theinquirer.net/inquirer/news/3008609/theres-a-patch-to-reinstate-windows-7-81-on-kaby-lake-cpus |url-status=dead |archive-date=April 20, 2017 |access-date=March 9, 2020}}</ref><ref>{{Cite web |author=pilao |title=zeffy/wufuc |url=https://github.com/zeffy/wufuc |website=GitHub |date=March 3, 2020 |access-date=March 9, 2020}}</ref><ref>{{Cite web |author=Przemysław |date=February 9, 2020 |title=p-lider/WuaCpuFix |website=[[GitHub]] |url=https://github.com/p-lider/WuaCpuFix |access-date=March 9, 2020}}</ref>
Some of the processors based on the Skylake microarchitecture are marketed as 6th-generation Core.<ref>{{Cite web |title=6th Generation Intel® Core i7-6700K and i5-6600K Processors |url=https://www.intel.com/content/www/us/en/processors/core/6th-gen-core-family-desktop-brief.html |website=Intel |language=en-US |access-date=May 25, 2018}}</ref><ref>{{Cite web |title=6th Generation Intel® Processor Family |url=https://www.intel.ca/content/www/ca/en/processors/core/desktop-6th-gen-core-family-spec-update.html |website=Intel |access-date=May 25, 2018}}</ref><ref>{{Cite news |last1=Ung |first1=Gordon |date=August 18, 2015 |title=Why Intel calls Skylake a 6th-generation CPU |url=https://www.pcworld.com/article/2969373/components-processors/why-intel-calls-skylake-a-6th-generation-cpu.html |work=PCWorld |language=en-US |access-date=May 25, 2018}}</ref>
Intel officially declared end of life and discontinued Skylake LGA 1151 CPUs on March 4, 2019.<ref>http://qdms.intel.com/dm/i.aspx/EED3D500-FB5C-47A2-82E1-BF8DF2E0EF11/PCN116799-00.pdf {{Bare URL PDF|date=March 2022}}</ref>
== Development history ==
Skylake's development, as with previous processors such as [[Pentium M|Banias]], [[Dothan (microprocessor)|Dothan]], [[Conroe (microprocessor)|Conroe]], [[Sandy Bridge]], and [[Ivy Bridge (microarchitecture)|Ivy Bridge]], was primarily undertaken by Intel Israel at its engineering research center in [[Haifa|Haifa, Israel]].<ref>{{cite web |title=Intel in Israel: A Old Relationship Faces New Criticism |url=http://knowledge.wharton.upenn.edu/article/intel-israel-old-relationship-faces-new-criticism/ |website=Knowledge at Wharton |access-date=January 24, 2018}}</ref> The final design was largely an evolution of Haswell, with minor improvements to performance and several power-saving features being added.<ref>{{cite web |date=August 19, 2015 |title=The many tricks Intel Skylake uses to go faster and use less power |url=https://arstechnica.com/information-technology/2015/08/the-many-tricks-intel-skylake-uses-to-go-faster-and-use-less-power/ |website=Ars Technica |access-date=7 November 2021}}</ref> A major priority of Skylake's design was to design a microarchitecture for envelopes as low as 4.5W to embed within [[tablet computers]] and [[laptop|notebooks]] in addition to higher-power [[desktop computers]] and [[Server (computing)|servers]].<ref>[http://news.techtime.co.il/2015/09/02/intel-4/ Intel Introduced its 6th Generation Intel Core] Published September 2, 2015, techtime.co.il</ref>
In September 2014, Intel announced the Skylake microarchitecture at the [[Intel Developer Forum]] in [[San Francisco]], and that volume shipments of Skylake CPUs were scheduled for the second half of 2015. The Skylake development platform was announced to be available in Q1 2015. During the announcement, Intel also demonstrated two computers with desktop and mobile Skylake prototypes: the first was a desktop [[testbed]] system, running the latest version of [[3DMark]], while the second computer was a fully functional laptop, playing [[4K resolution|4K]] video.<ref>{{cite web|url=http://www.cpu-world.com/news_2014/2014091001_Intel_announces_Skylake_microarchitecture.html|title=Intel announces Skylake microarchitecture |website=CPU World |access-date=January 24, 2018}}</ref>
An initial batch of Skylake CPU models (6600K and 6700K) was announced for immediate availability during the [[Gamescom]] on August 5, 2015,<ref name=launch>{{cite web|url=http://www.techpowerup.com/213616/intel-to-debut-its-core-skylake-processors-at-gamescom-2015.html|title=Intel to Debut its Core Skylake Processors at Gamescom 2015|work=TechPowerUp}}</ref> unusually soon after the release of its predecessor, Broadwell, which had suffered from launch delays.<ref>{{cite web|url=http://www.valuewalk.com/2014/09/intel-corporation-launching-broadwell-skylake-chips/|title=Intel Corporation Launching Broadwell, Skylake Chips Back to Back|work=ValueWalk|date=September 16, 2014 |access-date=October 17, 2014}}</ref> Intel acknowledged in 2014 that moving from 22 nm (Haswell) to 14 nm (Broadwell) had been its most difficult process to develop yet, causing Broadwell's planned launch to slip by several months;<ref>{{cite web |last1=Smith |first1=Ryan |date=August 11, 2014 |title=Intel's 14nm Technology in Detail |url=http://www.anandtech.com/show/8367/intels-14nm-technology-in-detail |website=AnandTech |access-date=January 24, 2018}}</ref> yet, the 14 nm production was back on track and in full production as of Q3 2014.<ref>{{cite web |last1=Sandhu |first1=Tarinder |date=September 9, 2014 |title=Intel Broadwell and Skylake client CPUs both launching in 2015 |url=http://hexus.net/tech/news/cpu/74481-intel-broadwell-skylake-client-cpus-launching-2015/ |website=Hexus |access-date=January 24, 2018}}</ref> Industry observers had initially believed that the issues affecting Broadwell would also cause Skylake to slip to 2016, but Intel was able to bring forward Skylake's release and shorten Broadwell's release cycle instead.<ref name=extremetech1>{{cite web |last1=Hruska |first1=Joel |date=July 14, 2014 |title=Intel's 14nm puzzle: As Skylake details leak, everybody asks – is the chip coming in 2015 or not? |url=http://www.extremetech.com/computing/186210-intels-14nm-puzzle-as-skylake-details-leak-everybody-asks-is-the-chip-coming-in-2015-or-not |work=ExtremeTech |access-date=October 17, 2014}}</ref><ref>{{cite web |last1=Arora |first1=Piyush |date=October 15, 2014 |title=Intel: Skylake Development Appears To Be On Schedule |url=http://seekingalpha.com/article/2563875-intel-skylake-development-appears-to-be-on-schedule |website=Seeking Alpha |access-date=January 24, 2018}}</ref> As a result, the Broadwell architecture had an unusually short run.<ref name=extremetech1 />
== Overclocking of unsupported processors ==
Officially Intel supported [[overclocking]] of only the K and X versions of Skylake processors. However, it was later discovered that other non-K chips could be overclocked by modifying the base clock value – a process made feasible by the base clock applying only to the CPU, RAM, and integrated graphics on Skylake. Through beta UEFI firmware updates, some motherboard vendors, such as [[ASRock]] (which prominently promoted it under the name Sky OC) allowed the base clock to be modified in this manner.<ref name=pcgamer-nonk>{{cite web |last1=Porter |first1=Matt |date=February 9, 2016 |title=Intel puts a stop to overclocking on non-K Skylake CPUs |url=http://www.pcgamer.com/intel-puts-a-stop-to-overclocking-on-non-k-skylake-cpus/ |website=PC Gamer |access-date=February 9, 2016}}</ref><ref name=hexus-nonkkod>{{cite web |last1=Tyson |first1=Mark |date=February 5, 2016 |title=Intel Skylake Non-K OC KOed by ASRock |url=http://hexus.net/tech/news/mainboard/90323-intel-skylake-non-k-oc-koed-asrock/ |website=Hexus |access-date=February 9, 2016}}</ref>
When overclocking unsupported processors using these UEFI firmware updates, several issues arise:
These issues are partly caused by the power management of the processor needing to be disabled for base clock overclocking to work.<ref name=hwbot>{{cite web|title=Non-K overclocking|url=http://wiki.hwbot.org/Skylake_overclocking#Non-K_overclocking|website=hwbot.org|access-date=May 5, 2021}}</ref>
In February 2016, however, an ASRock firmware update removed the feature. On February 9, 2016, Intel announced that it would no longer allow such overclocking of non-K processors, and that it had issued a CPU [[microcode]] update that removes the function.<ref name=anand-bclk>{{cite web |last1=Cutress |first1=Ian |date=December 11, 2015 |title=BCLK Overclocking Intel's non-K Skylake Processors: Coming Soon |url=http://www.anandtech.com/show/9848/bclk-overclocking-intels-non-k-skylake-processors-coming-soon |website=AnandTech |access-date=February 9, 2016}}</ref><ref>{{cite web |last1=ung |first1=Gordon |date=February 8, 2016 |title=It's official: Intel shuts down the cheap overclocking party by closing Skylake loophole |url=http://www.pcworld.com/article/3031255/hardware/its-official-intel-shuts-down-the-cheap-overclocking-party-by-closing-skylake-loophole.html |website=PCWorld |access-date=February 9, 2016}}</ref><ref name=pcworld-yesyoucan>{{cite web |last1=Ung |first1=Gordon |date=December 11, 2015 |title=Yes, you can overclock cheap Intel Skylake chips |url=http://www.pcworld.com/article/3014498/hardware/yes-you-can-overclock-cheap-intel-skylake-chips.html |website=PCWorld |access-date=February 9, 2016}}</ref> In April 2016, ASRock started selling motherboards that allow overclocking of unsupported CPUs using an external clock generator.<ref>{{cite web |last1=Hruska |first1=Joel |date=March 11, 2016 |title=New ASRock motherboards sport external clock generators for Intel CPU overclocking |url=http://www.extremetech.com/extreme/224561-new-asrock-motherboards-sport-external-clock-generators-for-intel-cpu-overclocking |website=ExtremeTech |access-date=April 10, 2016}}</ref><ref>{{cite web |title=独自OC機能を備えたH170マザーがASRockから登場、計2モデル - AKIBA PC Hotline! |url=http://akiba-pc.watch.impress.co.jp/docs/news/news/20160407_752021.html|last=株式会社インプレス |website=AKIBA PC Hotline! |language=ja-JP |date=April 7, 2016 |access-date=April 10, 2016}}</ref>
== Operating system support ==
In January 2016, Microsoft announced that it would end support of [[Windows 7]] and [[Windows 8.1]] on Skylake processors effective July 17, 2017; after this date, only the most critical updates for the two operating systems would be released for Skylake users if they have been judged not to affect the reliability of the OS on older hardware, and [[Windows 10]] would be the only [[Microsoft Windows]] platform officially supported on Skylake, as well as all future Intel CPU microarchitectures beginning with Skylake's successor [[Kaby Lake]]. [[Terry Myerson]] stated that Microsoft had to make a large investment in order to reliably support Skylake on older versions of Windows, and that future generations of processors would require further investments. Microsoft also stated that due to the age of the platform, it would be challenging for newer hardware, firmware, and device driver combinations to properly run under Windows 7.<ref name=ars-skylake18months>{{cite web |date=January 16, 2016 |title=Skylake users given 18 months to upgrade to Windows 10 |url=https://arstechnica.com/information-technology/2016/01/skylake-users-given-18-months-to-upgrade-to-windows-10/ |website=Ars Technica |access-date=January 16, 2016}}</ref><ref name=zdnet-newsupportpolicy>{{cite web |last1=Bott |first1=Ed |date=January 15, 2016 |title=Microsoft updates support policy: New CPUs will require Windows 10 |url=https://www.zdnet.com/article/microsoft-updates-support-policy-new-cpus-will-require-windows-10/ |website=ZD Net |access-date=January 16, 2016}}</ref>
On March 18, 2016, in response to criticism over the move, primarily from enterprise customers, Microsoft announced revisions to the support policy, changing the cutoff for support and non-critical updates to July 17, 2018 and stating that Skylake users would receive all critical security updates for Windows 7 and 8.1 through the end of extended support.<ref name=ars-oemskylake>{{cite web |title=Skylake support on Windows 7 and 8.1 given a one-year extension |url=https://arstechnica.com/information-technology/2016/03/skylake-support-on-windows-7-and-8-1-given-a-one-year-extension/ |website=Ars Technica |date=March 18, 2016 |access-date=March 18, 2016}}</ref><ref name=cw-skylakechange>{{cite web |last1=Keizer |first1=Gregg |date=March 18, 2016 |title=Microsoft backtracks on Windows 7 support deadline |url=http://www.computerworld.com/article/3046032/windows-pcs/microsoft-backtracks-on-windows-7-support-deadline.html |website=Computer World |access-date=March 18, 2016}}</ref> In August 2016, citing "a strong partnership with our OEM partners and Intel", Microsoft stated that it would continue to fully support 7 and 8.1 on Skylake through the end of their respective lifecycles.<ref>{{cite web |last1=Larsen |first1=Shad |date=August 11, 2016 |title=Updates to Silicon Support Policy for Windows|url=https://blogs.windows.com/business/2016/08/11/updates-to-silicon-support-policy-for-windows/|website=Windows Business Blog |publisher=Microsoft |language=en-US |access-date=9 May 2017 |archive-url=https://web.archive.org/web/20170425131840/https://blogs.windows.com/business/2016/08/11/updates-to-silicon-support-policy-for-windows/ |archive-date=April 25, 2017 |url-status=dead |df=mdy-all}}</ref><ref>{{cite news |last1=Foley |first1=Mary Jo |date=August 11, 2016 |title=Microsoft extends again support for Windows 7, 8.1 Skylake-based devices |url=https://www.zdnet.com/article/microsoft-extends-again-support-for-windows-7-8-1-skylake-based-devices/ |work=ZD Net |language=en-US |access-date=9 May 2017}}</ref> In addition, an enthusiast-created [[modding|modification]] was released that disabled the [[Windows Update]] check and allowed Windows 8.1 and earlier to continue to be updated on this and later platforms.<ref name=theinquirer.net>{{cite web |title=There's a patch to reinstate Windows 7 & 8.1 on Kaby Lake CPUs |url=https://www.theinquirer.net/inquirer/news/3008609/theres-a-patch-to-reinstate-windows-7-81-on-kaby-lake-cpus |website=The Inquirer |access-date=January 24, 2018 |archive-url=https://web.archive.org/web/20191222033451/https://www.theinquirer.net/inquirer/news/3008609/theres-a-patch-to-reinstate-windows-7-81-on-kaby-lake-cpus |archive-date=December 22, 2019 |url-status=dead}}</ref>
As of Linux kernel 4.10, Skylake mobile power management is supported with most Package C states supported seeing some use. Linux 4.11 enables Frame-Buffer Compression for the integrated graphics chipset by default, which lowers power consumption.<ref>{{cite web |last1=Larabel |first1=Michael |date=January 9, 2017 |title=Linux 4.11 To Enable Frame-Buffer Compression By Default For Skylake |url=http://www.phoronix.com/scan.php?page=news_item&px=Linux-4.11-FBC-Skylake |website=Phoronix |access-date=October 16, 2022}}</ref>
Skylake is fully supported on [[OpenBSD]] 6.2 and later, including [[hardware acceleration|accelerated]] graphics.<ref>{{cite web |title=OpenBSD 6.2 |url=https://www.openbsd.org/62.html |website=OpenBSD |access-date=October 10, 2018}}</ref>
For [[Windows 11]], only the high-end Skylake-X processors are officially listed as compatible.<ref>{{Cite web |title=Windows 11 supported Intel processors |url=https://learn.microsoft.com/en-us/windows-hardware/design/minimum/supported/windows-11-supported-intel-processors |website=Microsoft |language=en-US |date=January 17, 2022 |access-date=October 16, 2022}}</ref> All other Skylake processors are not officially supported due to security concerns.<ref>{{Cite web |date=June 28, 2021 |title=Update on Windows 11 minimum system requirements |url=https://blogs.windows.com/windows-insider/2021/06/28/update-on-windows-11-minimum-system-requirements/ |website=Windows Insider Blog |language=en-US |access-date=October 5, 2021}}</ref> However, it is still possible to manually upgrade using an ISO image (as Windows 10 users on those processors won't be offered to upgrade to Windows 11 via Windows Update), or perform a clean installation as long as the system has [[Trusted Platform Module]] (TPM) 2.0 enabled,<ref>{{Cite web |last1=Warren |first1=Tom |date=August 27, 2021 |title=Microsoft won't stop you installing Windows 11 on older PCs |url=https://www.theverge.com/22644194/microsoft-windows-11-minimum-system-requirements-processors-changes |website=The Verge |language=en-US |access-date=October 5, 2021}}</ref> but the user must accept that they will not be entitled to receive updates, and that damage caused by using Windows 11 on an unsupported configuration are not covered by the manufacturer's warranty.<ref>{{Cite web |last1=Hollister |first1=Sean |date=September 21, 2021 |title=Windows 11 won't stop older PCs, but it might make you sign this waiver |url=https://www.theverge.com/2021/9/21/22686457/windows-11-health-check-compatible-supported-cpu-old-pc-waiver |website=The Verge |language=en-US |access-date=October 5, 2021}}</ref><ref>{{Cite web |last1=Hollister |first1=Sean |date=August 28, 2021 |title=Microsoft is threatening to withhold Windows 11 updates if your CPU is old |url=https://www.theverge.com/2021/8/28/22646035/microsoft-windows-11-iso-workaround-no-update-guarantee |website=The Verge |language=en-US |access-date=October 5, 2021}}</ref>
== {{Anchor|SUNRISE-POINT}}Features ==
[[Image:Intel_CPU_Core_i7_6700K_Skylake_top.jpg|thumb|right|Skylake i7-6700K: Top view]]
[[Image:Intel_CPU_Core_i7_6700K_Skylake_bottom.jpg|thumb|right|Skylake i7-6700K: Bottom view]]
Like its predecessor, [[Broadwell (microarchitecture)|Broadwell]], Skylake is available in five variants, identified by the [[suffix]]es S (''SKL-S''), X (''SKL-X''), H (''SKL-H''), U (''SKL-U''), and Y (''SKL-Y''). SKL-S and SKL-X contain [[overclocking|overclockable]] K and X variants with [[unlocked multiplier]]s.<ref>{{cite web |last1=Tyson |first1=Mark |date=February 17, 2015 |title=Intel Skylake-S desktop CPUs expected at IDF 2015 in August |url=http://hexus.net/tech/news/cpu/80786-intel-skylake-s-desktop-cpus-expected-idf-2015-august |website=Hexus |language=en-US |access-date=October 16, 2022}}</ref> The H, U and Y variants are manufactured in [[ball grid array]] (BGA) packaging, while the S and X variants are manufactured in [[land grid array]] (LGA) packaging using a new socket, [[LGA 1151]] ([[LGA 2066]] for Skylake X).<ref name=wccftech-06-27>{{cite web |last=Pirzada |first=Syed Muhammad Usman |date=June 27, 2014 |title=Massive Intel 14nm Skylake Leak – Multiple eDRAM Configurations and Desktop Variant to have Configurable TDP |url=http://wccftech.com/intel-14nm-skylake-leak-multiple-edram-configurations-desktop-variant-tdp/ |website=Wccftech |language=en-US |access-date=June 28, 2014}}</ref> Skylake is used in conjunction with [[List of Intel chipsets#100/200 Series chipsets|Intel 100 Series chipsets]], also known as ''Sunrise Point''.<ref>{{cite web |title=Intel Core Skylake CPUs Accompanied by 100-series Chipset |url=http://www.techpowerup.com/200486/intel-core-skylake-cpus-accompanied-by-100-series-chipset.html |website=TechPowerUp |date=May 5, 2014 |access-date=May 8, 2014}}</ref>
The major changes between the Haswell and Skylake architectures include the removal of the [[fully integrated voltage regulator]] (FIVR) introduced with Haswell.<ref>{{cite web |last1=Pirzada |first1=Syed Muhammad Usman |date=June 5, 2014 |title=Intel to Abandon the Internal Voltage Regulator (IVR) with Skylake Microarchitecture |url=http://wccftech.com/intel-abandon-internal-voltage-regulator-skylake-microarchitecture/ |website=Wccftech |access-date=June 28, 2014 }}</ref> On the variants that will use a discrete [[Platform Controller Hub]] (PCH), [[Direct Media Interface]] (DMI) 2.0 is replaced by [[DMI 3.0]], which allows speeds of up to 8 [[Gigatransfer|GT]]/s.
Skylake's U and Y variants support one [[DIMM]] slot per channel, while H and S variants support two DIMM slots per channel.<ref name=wccftech-06-27 /> Skylake's launch and sales lifespan occur at the same time as the ongoing [[SDRAM]] market transition, with [[DDR3 SDRAM]] memory gradually being replaced by [[DDR4]] memory. Rather than working exclusively with DDR4, the Skylake microarchitecture remains [[backward compatible]] by interoperating with both types of memory. Accompanying the microarchitecture's support for both memory standards, a new SO-DIMM type capable of carrying either DDR3 or DDR4 memory chips, called [[UniDIMM]], was also announced.<ref>{{cite web
|title=How Intel Plans to Transition Between DDR3 and DDR4 for the Mainstream |url=http://www.techpowerup.com/205231/how-intel-plans-to-transition-between-ddr3-and-ddr4-for-the-mainstream.html |website=TechPowerUp |date=September 14, 2014 |access-date=November 19, 2014}}</ref>
Skylake's few P variants have a reduced on-die graphics unit (12 execution units enabled instead of 24 execution units) over their direct counterparts; see the table below. In contrast, with Ivy Bridge CPUs the P suffix was used for CPUs with completely disabled on-die video chipset.
Other enhancements include [[Thunderbolt 3.0]], [[SATA Express]], [[Iris Pro]] graphics with [[Direct3D feature level]] 12_1 with up to 128 MB of L4 [[eDRAM]] cache on certain SKUs.<ref>{{cite web |last1=Mujtaba |first1=Hassan |date=November 24, 2014 |title=Intel's 6th Generation Skylake Processors Scheduled For 2H 2015 – 5th Generation Broadwell in Spring '15, Updates 2015–2016 Mobility Roadmap |url=http://wccftech.com/intels-6th-generation-skylake-processors-scheduled-2h-2015-5th-generation-broadwell-spring-15-updates-2015-2016-mobility-roadmap/ |work=Wccftech |language=en-US |access-date=October 16, 2022}}</ref> The Skylake line of processors retires [[VGA]] support,<ref>{{cite web |title=Intel® Core i7-6700K Processor (8M Cache, up to 4.20 GHz) |url=https://ark.intel.com/products/88195/ |website=Intel |language=en-US |access-date=August 6, 2015}}</ref> while supporting up to five monitors connected via HDMI 1.4, DisplayPort 1.2 or Embedded DisplayPort (eDP) interfaces.<ref>{{cite web |last1=Larabel |first1=Michael |date=September 10, 2014 |title=Intel Publishes Initial Skylake Linux Graphics Support |url=https://www.phoronix.com/scan.php?page=news_item&px=MTc4NDc |website=Phoronix |language=en-US |access-date=January 24, 2018}}</ref> HDMI 2.0 ([[4K resolution|4K]]@60 Hz) is only supported on motherboards equipped with Intel's Alpine Ridge Thunderbolt controller.<ref>{{cite web |last1=Cutress |first1=Ian |date=August 5, 2015 |title=Intel Skylake Z170 Motherboards: A Quick Look at 55+ New Products |url=http://www.anandtech.com/show/9485/intel-skylake-z170-motherboards-asrock-asus-gigabyte-msi-ecs-evga-supermicro |website=AnandTech |language=en-US |access-date=August 6, 2015}}</ref>
The Skylake instruction set changes include [[Intel MPX]] (Memory Protection Extensions) and [[Intel SGX]] (Software Guard Extensions). Future Xeon variants will also have [[Advanced Vector Extensions]] 3.2 (AVX-512F).<ref name=bitsnchips>{{cite web |last1=Forni |first1=Scritto da Gian Maria |date=February 27, 2015 |title=AVX-512 SIMD enabled only on Xeon models of SkyLake |url=http://www.bitsandchips.it/english/52-english-news/5297-avx-512-simd-enabled-only-on-xeon-models-of-skylake |work=Bits and Chips |access-date=October 16, 2022}}</ref><ref name=avx512>{{cite web |last1=Shilov |first1=Anton |date=March 2, 2015 |title=Intel 'Skylake' processors for PCs will not support AVX-512 instructions |url=https://www.kitguru.net/components/cpu/anton-shilov/intel-skylake-processors-for-pcs-will-not-support-avx-512-instructions/ |website=KitGuru |access-date=January 24, 2018}}</ref>
Skylake-based laptops were predicted to use wireless technology called [[Rezence (wireless charging standard)|Rezence]] for charging, and other wireless technologies for communication with peripherals. Many major PC vendors agreed to use this technology in Skylake-based laptops; however, no laptops were released with the technology as of 2019.<ref>{{cite web |last1=Heath |first1=Nick |date=September 10, 2014 |title=Wire-free PCs, tablets and phones coming in 2015 says Intel |url=https://www.zdnet.com/wire-free-pcs-tablets-and-phones-coming-in-2015-says-intel-7000033549/ |work=ZDNet |access-date=October 16, 2022}}</ref><ref>{{cite web |date=November 11, 2018 |title=Counterclockwise: the wireless charging format wars |url=https://www.gsmarena.com/counterclockwise_the_wireless_charging_format_wars-news-34143.php |work=GSMArena |access-date=October 16, 2022}}</ref>
The integrated GPU of Skylake's S variant supports on Windows [[DirectX]] 12 Feature Level 12_1, [[OpenGL]] 4.6 with latest Windows 10 driver update<ref>{{cite web |title=DRIVER VERSION: 31.0.101.2114 |url=https://downloadmirror.intel.com/750889/ReleaseNotes_101.2114.pdf |website=Intel |language=en-US |access-date=October 20, 2022}}</ref> (OpenGL 4.5 on Linux<ref>{{cite web |last1=Larabel |first1=Michael |date=November 1, 2016 |title=Mesa 13.0 Released With Intel OpenGL 4.5, RADV Radeon Vulkan Driver |url=http://www.phoronix.com/scan.php?page=article&item=mesa-13 |website=Phoronix |language=en-US |access-date=October 16, 2022}}</ref>) and [[OpenCL]] 3.0 standards. The [[Intel Quick Sync Video|Quick Sync]] video engine now includes support for [[VP9]] (GPU accelerated decode only), [[VP8]] and [[High Efficiency Video Coding|HEVC]] (hardware accelerated 8-bit encode/decode and GPU accelerated 10-bit decode), and supports for resolutions up to 4096{{resx}}2048.<ref>{{cite web |title=Intel Skylake-S CPUs and 100-series Chipsets Detailed in Apparent Leak |url=http://gadgets.ndtv.com/laptops/news/intel-skylake-s-cpus-and-100-series-chipsets-detailed-in-apparent-leak-682437 |work=NDTV Gadgets |date=April 17, 2015 |access-date=October 16, 2022}}</ref><ref>{{cite web |last1=Cunningham |first1=Andrew |date=August 19, 2015 |title=Skylake's graphics architecture: Intel is still gunning for dedicated GPUs |url=https://arstechnica.com/gadgets/2015/08/skylakes-graphics-architecture-intel-is-still-gunning-for-dedicated-gpus/ |website=Ars Technica |language=en-US |access-date=August 18, 2015}}</ref><ref name="anand-quicksync">{{cite web |last1=T. S. |first1=Ganesh |date=August 26, 2015 |title=Intel's Skylake GPU - Analyzing the Media Capabilities |url=https://www.anandtech.com/show/9562/intels-skylake-gpu-analyzing-the-media-capabilities |website=AnandTech |access-date=6 July 2022}}</ref>
Intel also released unlocked (capable of overclocking) mobile Skylake CPUs.<ref>{{cite web |title=Intel Unleashes Next-Gen Enthusiast Desktop PC Platform at Gamescom |url=https://newsroom.intel.com/chip-shots/chip-shot-intel-unleashes-next-gen-enthusiast-desktop-pc-platform-at-gamescom/ |website=Intel Newsroom |date=August 5, 2015 |access-date=August 10, 2015}}</ref>
Unlike previous generations, Skylake-based Xeon E3 no longer works with a desktop chipset that supports the same socket, and requires either the C232 or the C236 chipset to operate.
== Known issues ==
Short loops with a specific combination of instruction use may cause unpredictable system behavior on CPUs with hyperthreading. A [[microcode]] update was issued to fix the issue.<ref>{{cite web |last1=Goetting |first1=Chris |date=June 25, 2017 |title=[Updated] Critical Flaw In Intel Skylake And Kaby Lake HyperThreading Discovered Requiring BIOS Microcode Fix |url=https://hothardware.com/news/critical-flaw-in-intel-skylake-and-kaby-lake-hyperthreading-discovered-requiring-bios-microcode-fix |website=HotHardware |access-date=January 24, 2018}}</ref>
Skylake is vulnerable to [[Spectre (security vulnerability)|Spectre]] attacks.<ref>{{cite web|url=https://lwn.net/Articles/745113/|title=Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation [LWN.net]|website=Lwn.net|access-date=January 24, 2018}}</ref>
In fact, it is more vulnerable than other processors because it uses indirect branch speculation not just on indirect branches but also when the return prediction stack underflows.
The latency for the [[spinlock]] {{code|PAUSE}} instruction has been increased dramatically (from the usual 10 cycles to 141 cycles in Skylake), which can cause performance issues with older programs or libraries using pause instructions.<ref>{{cite web |last1=Kraus |first1=Alois |title=Why Skylake CPUs Are Sometimes 50% Slower – How Intel Has Broken Existing Code |url=https://aloiskraus.wordpress.com/2018/06/16/why-skylakex-cpus-are-sometimes-50-slower-how-intel-has-broken-existing-code/ |language=en |date=16 June 2018}}</ref> Intel documents the increased latency as a feature that improves power efficiency.<ref>{{cite web |title=Intel® 64 and IA-32 Architectures Optimization Reference Manual 248966-033 |url=https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-optimization-manual.pdf |website=Intel |language=en-US |date=June 2016}}</ref>
== Architecture changes compared to [[Broadwell (microarchitecture)|Broadwell]] microarchitecture ==
[[File: Skylake_architecture_diagram.png |900px]]
=== CPU ===
* [[Intel MPX]] (Memory Protection Extensions)
* Intel [[Software Guard Extensions|SGX]] (Software Guard Extensions)
* Intel Speed Shift<ref>{{cite web |last1=Howse |first1=Brett |date=November 6, 2015 |title=Examining Intel's New Speed Shift Tech on Skylake: More Responsive Processors |url=http://www.anandtech.com/show/9751/examining-intel-skylake-speed-shift-more-responsive-processors |website=AnandTech |access-date=April 16, 2016}}</ref>
*Larger [[Re-order buffer]] (224 entries, up from 192)
* [[L1 cache]] size unchanged at 32 [[kilobyte|KB]] instruction and 32 KB data cache per core.
*[[L2-Cache|L2 cache]] was changed from 8-way to 4-way set associative<ref>{{Cite web |title=Skylake (client) - Microarchitectures - Intel |url=https://en.wikichip.org/wiki/intel/microarchitectures/skylake_(client) |website=WikiChip |language=en |access-date=February 8, 2021}}</ref>
*Voltage regulator module ([[FIVR]]) is moved back to the motherboard
*Enhancements of Intel Processor Trace: fine grained timing through CYC packets (cycle-accurate mode) and support for [[Program Counter|IP (Instruction Pointer)]] address filtering.<ref>{{Cite web |title=Cheat sheet for Intel Processor Trace with Linux perf and GDB at Andi Kleen's blog |url=http://halobates.de/blog/p/410}}</ref>
* 64 to 128 MB L4 [[eDRAM]] cache on certain SKUs
=== GPU ===
* Skylake's integrated [[Intel HD and Iris Graphics|Gen9 GPU]] supports Direct3D 12 at the [[Direct3D feature level|feature level 12_1]]<ref name=software.intel.com /><ref name=pchardware_skylake>{{cite web |last1=Spille |first1=Carsten |date=August 5, 2015 |title=Intel Skylake: Core i7-6700K und i5-6600K im Test |url=http://www.pcgameshardware.de/Core-i7-6700K-CPU-260905/Tests/Skylake-Test-Core-i7-6700K-i5-6600K-1166741/#a3 |work=PC Games Hardware Online |language=de |access-date=August 5, 2015}}</ref><ref>{{cite web |title=Game Dev - Graphics API Developer's Guide For 6th Generation Intel® Core Processors |url=https://software.intel.com/en-us/articles/6th-gen-graphics-api-dev-guide |website=Intel |access-date=April 16, 2016}}</ref>
* Full fixed function [[High Efficiency Video Coding|HEVC]] Main/8bit encoding/decoding acceleration. Hybrid/Partial HEVC Main10/10bit decoding acceleration. [[JPEG]] encoding acceleration for resolutions up to 16,000×16,000 pixels. Partial [[VP9]] encoding/decoding acceleration.<ref>{{cite web |last1=Cutress |first1=Ian |date=August 5, 2015 |title=The Intel 6th Gen Skylake Review: Core i7-6700K and i5-6600K Tested |url=http://www.anandtech.com/show/9483/intel-skylake-review-6700k-6600k-ddr4-ddr3-ipc-6th-generation/4 |website=AnandTech |access-date=January 24, 2018}}</ref>
=== I/O ===
* [[LGA 1151]] socket for mainstream desktop processors and [[LGA 2066]] socket for enthusiast gaming/workstation X-series processors
* 100-series chipset ([[List of Intel chipsets#LGA 1151 rev 1|Sunrise Point]])<ref>{{cite web |last1=Mujtaba |first1=Hassan |date=June 6, 2014 |title=Intel's Cannonlake 10nm Microarchitecture is Due For 2016 – Compatible On Union Bay With Union Point PCH |url=http://wccftech.com/intels-cannonlake-10nm-microarchitecture-due-2016-compatible-union-bay-union-point-pch |website=Wccftech |access-date=June 15, 2014}}</ref>
* X-series uses X299-series chipset
*[[DMI 3.0]] (From [[DMI 2.0]])
* Support for both [[DDR3L]] SDRAM and [[DDR4 SDRAM]] in mainstream variants, using custom [[UniDIMM]] SO-DIMM form factor<ref name=wccftech-06-04>{{cite web |last1=Mujtaba |first1=Hassan |date=June 4, 2014 |title=Intel Skylake Processors To Launch in 2H 2015 – Compatible With LGA 1151 Socket and Z170 Chipset, Will Feature DDR3 / DDR4 Memory Support |url=http://wccftech.com/intel-skylake-processors-launch-2h-2015-feature-ddr3-ddr4-memory-support-compatible-lga-1151-socket-z170-chipset |website=Wccftech |access-date=June 9, 2014}}</ref><ref>{{cite web |last1=Shilov |first1=Anton |date=April 4, 2012 |title=Intel to Start DDR4 Usage with Server Platforms in 2014. |url=http://www.xbitlabs.com/news/memory/display/20120404214706_Intel_to_Start_DDR4_Usage_with_Server_Platforms_in_2014.html |website=X-Bit Laboratories |access-date=October 5, 2013 |url-status=dead |archive-url=https://web.archive.org/web/20131012044133/http://www.xbitlabs.com/news/memory/display/20120404214706_Intel_to_Start_DDR4_Usage_with_Server_Platforms_in_2014.html |archive-date=October 12, 2013 |df=mdy-all}}</ref><ref>{{cite web |last1=Pirzada |first1=Usman |date=September 14, 2014 |title=Intel Skylake Could Feature Dual DDR3/DDR4 Memory Support with Double IMCs |url=http://wccftech.com/intel-skylake-dual-ddr3-ddr4-memory |website=Wccftech |language=en-US |access-date=November 20, 2014}}</ref> with up to 64 [[Gigabyte|GB]] of [[Random-access memory|RAM]] on [[LGA 1151|LGA 1151]] variants. Usual [[DDR3 SDRAM|DDR3]] memory is also supported by certain motherboard vendors even though Intel doesn't officially support it.<ref>{{cite web |title=GIGABYTE – Motherboard – Socket 1151 – GA-Z170-HD3 DDR3 (rev. 1.0) |url=http://www.gigabyte.com/products/product-page.aspx?pid=5488 |website=Gigabyte |access-date=September 7, 2015}}</ref><ref>{{cite web |last1=Sexton |first1=Michael Justom Allen |date=September 28, 2015 |title=Skylake's IMC Supports Only DDR3L |url=http://www.tomshardware.com/news/skylake-memory-support,30185.html |website=Tom's Hardware |language=en-US |access-date=September 29, 2015}}</ref>
* Support for 16 [[PCI Express]] 3.0 lanes from CPU, 20 [[PCI Express#PCI Express 3.0|PCIe 3.0]] lanes from PCH (LGA 1151), 44 [[PCI Express#PCI Express 3.0|PCIe 3.0]] lanes for Skylake-X
* Support for [[Thunderbolt 3]] (Alpine Ridge)<ref>{{cite web |last1=Kirsch |first1=Nathan |date=May 5, 2014 |title=Intel 2015 Platform Roadmap Shows Skylake CPUs, 100 Series Chipset and DDR4 |url=http://www.legitreviews.com/intel-2015-platform-roadmap-shows-skylake-cpus-100-series-chipset-and-ddr4_141247 |website=Legit Reviews |access-date=May 8, 2014}}</ref>
=== Other ===
* [[Thermal design power]] (TDP) up to 95 W (LGA 1151); up to 165 W (LGA 2066)<ref>{{cite web |last1=Mujtaba |first1=Hassan |date=June 5, 2014 |title=Intel 14nm Skylake Desktop 'Sky Bay Platform Detailed – TDPs For DT, H-Series, U-Series, Y-Series Unveiled, Quad Core With GT4e GPU Has 95W TDP |url=http://wccftech.com/intel-10nm-skylake-desktop-platform-arrives-2015-tdps-dt-hseries-useries-yseries-unveiled-quad-core-gt4e-gpu-95w-tdp |website=Wccftech |access-date=June 9, 2014}}</ref>
* [[14 nm]] manufacturing process<ref name=:0>{{cite web |title=6th Generation Intel® Core Processor Family Datasheet, Vol. 1 |url=http://www.intel.com/content/www/us/en/processors/core/desktop-6th-gen-core-family-datasheet-vol-1.html |website=Intel |access-date=August 22, 2015}}</ref>
== Configurations ==
Skylake processors are produced in five main families: Y, U, H, S, and X. Multiple configurations are available within each family:<ref name=wccftech-06-27 />
{| class=wikitable style=text-align: center;
|-
== List of Skylake processor models ==
=== Desktop processors ===
[[File:Intel@14nm@Skylake@Skylake-S@Core i7-6700@SR2BT Stack-DSC02973-DSC03021 - ZS-retouched (30035867736).jpg|thumb|Intel i7-6700 die shot]]
Common features of the mainstream desktop Skylake CPUs:
* [[Direct Media Interface|DMI 3.0]] and [[PCI Express 3.0|PCIe 3.0]] interfaces
* Dual channel memory support in the following configurations: DDR3L-1600 1.35 V (32 GB maximum) or DDR4-2133 1.2 V (64 GB maximum). DDR3 is unofficially supported through some motherboard vendors<ref>{{cite web |title=GIGABYTE – Motherboard – Socket 1151 – GA-Z170-HD3 DDR3 (rev. 1.0) |url=http://www.gigabyte.com/products/product-page.aspx?pid=5488 |website=Gigabyte |access-date=November 2, 2015}}</ref><ref>{{cite web |title=Z170-P D3 – Overview |url=https://www.asus.com/Motherboards/Z170-P-D3/ |website=ASUS |access-date=November 2, 2015}}</ref><ref>{{cite web |title=ASRock > Z170 Pro4/D3 |url=http://www.asrock.com/mb/Intel/Z170%20Pro4D3/ |website=ASRock |access-date=November 2, 2015}}</ref>
* 16 [[PCI Express|PCI-E]] 3.0 lanes
* The Core-branded processors support the AVX2 instruction set. The Celeron and Pentium-branded ones support only SSE4.1/4.2
* 350 MHz base graphics clock rate
==== Mainstream desktop processors ====
{| style=text-align: center; class=wikitable sortable
|-
! rowspan=2 | Cores<br />(threads)
! rowspan=2 colspan=2 | Processor<br />branding and model
! rowspan=2 | CPU<br/>[[clock rate|clock<br/>rate]]
! colspan=3 |[[Intel Turbo Boost|Turbo]] clock GHz
Num of cores
! rowspan=2 | [[Intel HD and Iris Graphics|GPU]]
! rowspan=2 | [[Execution unit|EUs]]
! rowspan=2 | Max<br/>graphics<br/>clock rate
! rowspan=2 | L2<br/>cache
! rowspan=2 | [[L3 cache|L3<br />cache]]
! rowspan=2 | L4 cache<br/>(eDRAM)
! rowspan=2 | [[Thermal design power|TDP]]
! rowspan=2 | Socket
| rowspan=4 | 4 (8)
| rowspan=4 | Core i7
| '''[http://ark.intel.com/products/88195/ 6700K]'''
| 4.0 GHz
| 4.2
|$339
|-
|[http://ark.intel.com/products/93339/Intel-Core-i7-6785R-Processor-8M-Cache-up-to-3_90-GHz 6785R]
| 3.3 GHz
| 3.9
|$370
|-
| [http://ark.intel.com/products/88196/ 6700]
| 3.4 GHz
| 4.0
| $303
|-
| [http://ark.intel.com/products/88200/ 6700T]
| 2.8 GHz
| 3.6
| rowspan=10 | 4 (4)
| rowspan=10 | Core i5
| '''[http://ark.intel.com/products/88191/ 6600K]'''
| 3.5 GHz
| 3.9
| $242
|-
|[http://ark.intel.com/products/93338/Intel-Core-i5-6685R-Processor-6M-Cache-up-to-3_80-GHz 6685R]
| 3.2 GHz
| 3.8
|$288
|-
| [http://ark.intel.com/products/88188 6600]
| 3.3 GHz
|3.9
| $213
|-
|[http://ark.intel.com/products/93337/Intel-Core-i5-6585R-Processor-6M-Cache-up-to-3_60-GHz 6585R]
| 2.8 GHz
| rowspan=2 | 3.6
|$255
|-
| '''[http://ark.intel.com/products/88184 6500]'''
| 3.2 GHz
| 3.3
| $192
|-
| [http://ark.intel.com/products/88189/ 6600T]
| 2.7 GHz
| 3.5
| $213
|-
|[http://ark.intel.com/products/88183/Intel-Core-i5-6500T-Processor-6M-Cache-up-to-3_10-GHz 6500T]
| 2.5 GHz
| 3.1
|$192
|-
| [http://ark.intel.com/products/93277 6402P]
| 2.8 GHz
| 3.4
| rowspan=3 | $182
|-
| [http://ark.intel.com/products/88187 6400T]
| 2.2 GHz
| 2.8
|Q3 2015
|-
|'''[http://ark.intel.com/products/88185 6400]'''
| 2.7 GHz
| 3.3
| rowspan=6 | 2 (4)
| rowspan=6 | Core i3
| [http://ark.intel.com/products/90733/ 6320]
| 3.9 GHz
| rowspan=16 colspan=3 {{N/A}}
| $149
|-
|'''[http://ark.intel.com/products/90731/ 6300]'''
| 3.8 GHz
| $138
|-
|[http://ark.intel.com/products/90729 6100]
| 3.7 GHz
| 1050 MHz
| $117
|-
|[http://ark.intel.com/products/90728/Intel-Core-i3-6300T-Processor-4M-Cache-3_30-GHz 6300T]
|3.3 GHz
| rowspan=2 | {{0}}950 MHz
| $138
|-
|[http://ark.intel.com/products/90734/Intel-Core-i3-6100T-Processor-3M-Cache-3_20-GHz 6100T]
|3.2 GHz
| rowspan=8 | 3 MB
| rowspan=2 | $117
|-
|[http://ark.intel.com/products/93366 6098P]
| 3.6 GHz
| HD 510
| rowspan=10 | 2 (2)
| rowspan=6 | Pentium
| [http://ark.intel.com/products/90732 G4520]
| 3.6 GHz
| rowspan=3 | HD 530
| $86
|-
| [http://ark.intel.com/products/90730 G4500]
| 3.5 GHz
| rowspan=2 | $75
|-
| [http://ark.intel.com/products/90725 G4500T]
| 3.0 GHz
| {{0}}950 MHz
| Q3 2015
|-
| [http://ark.intel.com/products/88179 G4400]
| 3.3 GHz
| rowspan=7 |HD 510
| rowspan=2 | $64
|-
| [http://ark.intel.com/products/90614 G4400T]
| 2.9 GHz
| rowspan=6 | {{0}}950 MHz
| Q3 2015
|-
|[http://ark.intel.com/products/90610 G4400TE]
| 2.4 GHz
| rowspan=5 | Q4 2015
|-
| rowspan=4 |Celeron
|[http://ark.intel.com/products/90737 G3920]
| 2.9 GHz
| rowspan=4 | 2 MB
| $52
|-
| [http://ark.intel.com/products/90741 G3900]
| 2.8 GHz
| rowspan=3 | $42
|-
| [http://ark.intel.com/products/90711 G3900TE]
| 2.3 GHz
| rowspan=2 | 35 W
|-
| [http://ark.intel.com/products/90738 G3900T]
| 2.6 GHz
|}
=== Skylake-X (High-end desktop processors) ===
Common features of the high performance Skylake-X CPUs:
* Quad channel memory support for DDR4-2400 (on the i7-7800X) or DDR4-2666 (on all other CPUs)<ref name=TR_skylakeX>{{cite news |last1=Kampman |first1=Jeff |date=May 30, 2017 |title=Intel's Core X-series CPUs and X299 platform revealed |url=https://techreport.com/review/31986/intel-core-x-series-cpus-and-x299-platform-revealed |website=Tech Report |access-date=June 1, 2017}}</ref> up to 128 GB
* 28 (for the i7-7800X and i7-7820X) to 44 (for all other CPUs) [[PCI Express#PCI Express 3.0|PCIe 3.0]] lanes
* In addition to the AVX2 instruction set, they also support the [[AVX-512]] instructions
* No built-in iGPU (integrated graphics processor)
* Turbo Boost Max Technology 3.0 for up to 2/4 threads workloads for CPUs that have 8 cores and more (7820X, 7900X, 7920X, 7940X, 7960X, 7980XE, and all 9th generation chips)<ref>{{Cite web |title=Intel Core X Series Processor Overview |url=https://newsroom.intel.com/newsroom/wp-content/uploads/sites/11/2017/08/intel-core-x-series-processor-overview.pdf |website=Intel Newsroom |language=en-US |date=August 2017 |access-date=January 24, 2018}}</ref>
* A different cache hierarchy (when compared to client Skylake CPUs or previous architectures)
[[File:Intel@14nm@@Skylake@Skylake-X(LCC)@i7-7820X@SR3L5 Stack-DSC09155-DSC09210 - ZS-retouched (28088639909).jpg|thumb|Intel i7-7820X die shot]]
{| class="wikitable" style="text-align: center;"
! rowspan="2" | Model
! rowspan="2" | Release date
! rowspan="2" | Price <br/> (USD)
! rowspan="2" | [[CPU core|Cores]] <br/>([[Thread (computing)|Threads]])
! rowspan="2" | Base Clock <br/>(GHz)
! rowspan="1" colspan="2" | Turbo Clock
! rowspan="1" colspan="2" | [[Intel HD and Iris Graphics|GPU]]
! rowspan="2" | L3 Cache
! rowspan="2" | Socket
! rowspan="1" colspan="2" | Memory<br/>support
! rowspan="1" colspan="2" | Power
|-
! Single Core <br/>(GHz)
! Turbo Boost <br/> Max 3.0 <br/>(GHz)
! rowspan="1" | Model
! rowspan="1" | Max GPU<br>clock rate <br/>(GHz)
! [[DDR4 SDRAM|DDR4]]
! {{abbr|ECC|Error correction code memory}}
! {{abbr|TDP|Thermal Design Power}}
! Turbo
|-
! colspan=21 style="text-align:left; background-color:#127CC1; color:#fff;" | Core i7
|-
! style="text-align: left" | [https://www.intel.co.uk/content/www/uk/en/products/sku/123767/intel-core-i77820x-xseries-processor-11m-cache-up-to-4-30-ghz/specifications.html 7800X]
| rowspan="2" | June 26, 2017
| $389
| 6 (12)
| 3.6
| 4.3
| 4.5
| colspan="2" rowspan="2" {{NA}}
| 8.25 MB
| rowspan="2" | [[LGA 2066]]
| rowspan="2" | DDR4-2666 <br><small>[[Multi-channel memory architecture|quad-channel]]</small>
| rowspan="2" {{no}}
| rowspan="2" | 140W
|
|-
! style="text-align: left" | [https://www.intel.co.uk/content/www/uk/en/products/sku/123589/intel-core-i77800x-xseries-processor-8-25m-cache-up-to-4-00-ghz/specifications.html 7820X]
| $599
| 8 (16)
| 3.5
| 4.0
| 4.0
| 11 MB
|
|-
! colspan=21 style="text-align:left; background-color:#127CC1; color:#fff;" | Core i9
|-
! style="text-align: left" | [https://www.intel.co.uk/content/www/uk/en/products/sku/123613/intel-core-i97900x-xseries-processor-13-75m-cache-up-to-4-30-ghz/specifications.html 7900X]
| June 26, 2017
| $999
| 10 (20)
| 3.3
| 4.3
| 4.5
| colspan="2" rowspan="6" {{NA}}
| 13.75 MB
| rowspan="6" | [[LGA 2066]]
| rowspan="6" | DDR4-2666 <br><small>[[Multi-channel memory architecture|quad-channel]]</small>
| rowspan="6" {{no}}
| rowspan="2" | 140W
|
|-
! style="text-align: left" | [https://www.intel.com/content/www/us/en/products/sku/126240/intel-core-i97920x-xseries-processor-16-5m-cache-up-to-4-30-ghz/specifications.html 7920X]
| August 28, 2017
| $1199
| 12 (24)
| 2.9
| 4.3
| 4.4
| 16.5 MB
|
|-
! style="text-align: left" | [https://www.intel.co.uk/content/www/uk/en/products/sku/126695/intel-core-i97940x-xseries-processor-19-25m-cache-up-to-4-30-ghz/specifications.html 7940X]
| rowspan="3" | September 25, 2017
| $1399
| 14 (28)
| 3.1
| 4.3
| 4.4
| 19.25 MB
| rowspan="3" | 165W
|
|-
! style="text-align: left" | [https://www.intel.co.uk/content/www/uk/en/products/sku/126697/intel-core-i97960x-xseries-processor-22m-cache-up-to-4-20-ghz/specifications.html 7960X]
| $1699
| 16 (32)
| 2.8
| 4.2
| 4.4
| 22 MB
|-
! style="text-align: left" | [https://www.intel.co.uk/content/www/uk/en/products/sku/126699/intel-core-i97980xe-extreme-edition-processor-24-75m-cache-up-to-4-20-ghz/specifications.html 7980XE]
| $1999
| 18 (36)
| 2.6
| 4.2
| 4.4
| 24.75 MB
| 230W
|-
|}
{| class="wikitable" style="text-align: center;"
! rowspan="2" | Model
! rowspan="2" | Release date
! rowspan="2" | Price <br/> (USD)
! rowspan="2" | [[CPU core|Cores]] <br/> ([[Thread (computing)|Threads]])
! rowspan="2" | Base Clock <br/>(GHz)
! rowspan="1" colspan="2" | Turbo Clock
! rowspan="1" colspan="2" | [[Intel HD and Iris Graphics|GPU]]
! rowspan="2" | L3 Cache
! rowspan="2" | Socket
! rowspan="1" colspan="2" | Memory<br>support
! rowspan="1" colspan="2" | Power
|-
! Single core <br/>(GHz)
! Turbo Boost <br/> Max 3.0 <br/>(GHz)
! rowspan="1" | Model
! rowspan="1" | Max GPU<br>clock rate <br/>(GHz)
! DDR4
! {{abbr|ECC|Error correction code memory}}
! {{abbr|TDP|Thermal Design Power}}
! Turbo
|-
! colspan=21 style="text-align:left; background-color:#127CC1; color:#fff;" | Core i7
|-
! style="text-align: left" | [https://ark.intel.com/content/www/us/en/ark/products/189122/intel-core-i7-9800x-x-series-processor-16-5m-cache-up-to-4-50-ghz.html 9800X]
| November 8, 2018 {{nbsp}}{{nbsp}}
| $589
| 8 (16)
| 3.8
| 4.4
| 4.5
| colspan="2" {{NA}}
| 16.5 MB
| [[LGA 2066]]
| DDR4-2666 <br><small>[[Multi-channel memory architecture|quad-channel]]</small>
| {{no}}
| 165W
|
|-
! colspan=21 style="text-align:left; background-color:#127CC1; color:#fff;" | Core i9
|-
! style="text-align: left" | [https://ark.intel.com/content/www/us/en/ark/products/189121/intel-core-i9-9820x-x-series-processor-16-5m-cache-up-to-4-20-ghz.html 9820X]
| rowspan="7" | November 8, 2018 {{nbsp}}{{nbsp}}
| $889
| rowspan="2" | 10 (20)
| 3.3
| 4.1
| 4.2
| colspan="2" rowspan="7" {{NA}}
| 16.5 MB
| rowspan="7" | [[LGA 2066]]
| rowspan="7" | DDR4-2666 <br><small>[[Multi-channel memory architecture|quad-channel]]</small>
| rowspan="7" {{no}}
| rowspan="7" | 165W
|
|-
! style="text-align: left" | [https://ark.intel.com/content/www/us/en/ark/products/189124/intel-core-i9-9900x-x-series-processor-19-25m-cache-up-to-4-50-ghz.html 9900X]
| $989
| 3.5
| rowspan="5" | 4.4
| rowspan="5" | 4.5
| rowspan="3" | 19.25 MB
|
|-
! style="text-align: left" | [https://ark.intel.com/content/www/us/en/ark/products/189127/intel-core-i9-9920x-x-series-processor-19-25m-cache-up-to-4-50-ghz.html 9920X]
| $1189
| 12 (24)
| 3.5
|
|-
! style="text-align: left" | [https://ark.intel.com/content/www/us/en/ark/products/189125/intel-core-i9-9940x-x-series-processor-19-25m-cache-up-to-4-50-ghz.html 9940X]
| $1387
| 14 (28)
| 3.3
|-
! style="text-align: left" | [https://ark.intel.com/content/www/us/en/ark/products/189123/intel-core-i9-9960x-x-series-processor-22m-cache-up-to-4-50-ghz.html 9960X]
| $1684
| 16 (32)
| 3.1
| 22 MB
|
|-
! style="text-align: left" | [https://ark.intel.com/content/www/us/en/ark/products/189126/intel-core-i9-9980xe-extreme-edition-processor-24-75m-cache-up-to-4-50-ghz.html 9980XE]
| $1979
| 18 (36)
| 3.0
| 24.75 MB
|
|-
|}
{{cpulist|lake-e|skylake_e|model=Xeon Gold 6152 |ark=120491|sspec1=SR3B4|step1=H0|cores=22|threads=44|l3=30.25|mult=21|turbo=2.8/3.7GHz|upi=3 × 10.4|tdp=140|mem=6 × DDR4-2666|date=11 July 2017||sock=3647|part2=BX806736152|part1=CD8067303406000|price=$3655<br />$3661}}
{{cpulist|lake-e|skylake_e|model=Xeon Gold 6150 |ark=120490|sspec1=SR37K|step1=H0|cores=18|threads=36|l3=24.75|mult=27|turbo=3.4/3.7GHz|upi=3 × 10.4|tdp=165|mem=6 × DDR4-2666|date=11 July 2017||sock=3647|part1=CD8067303328000|price=$3358}}
{{cpulist|lake-e|skylake_e|model=Xeon Gold 6149 |ark= |sspec1=SR3G2 |step1=H0|cores=16|threads=32|l3= |mult=31|turbo= |upi=3 × 10.4|tdp= |mem=6 × DDR4-2666|date=||sock=3647|part1=|price=OEM}}
{{cpulist|lake-e|skylake_e|model=Xeon Gold 6148 |ark=120489|sspec1=SR3B6|step1=H0|cores=20|threads=40|l3=27.50|mult=24|turbo=3.1/3.7GHz|upi=3 × 10.4|tdp=150|mem=6 × DDR4-2666|date=11 July 2017||sock=3647|part2=BX806736148|part1=CD8067303406200|price=$3072<br />$3078}}
{{cpulist|lake-e|skylake_e|model=Xeon Gold 6148F|ark=123690|sspec1=SR3KJ|step1=H0|cores=20|threads=40|l3=27.50|mult=24|turbo=3.1/3.7GHz|upi=2 × 10.4|tdp=150|mem=6 × DDR4-2666|date=11 July 2017||sock=3647|part1=CD8067303593800|price=$3227}}
| 