Skylake (microarchitecture)

Skylake
CPUID code 0506e3h
Product code 80662
L1 cache 64 KiB per core
L2 cache 256 KiB per core
L3 cache 8192 KiB shared
Created Launched at Gamescom on August 5, 2015[1]
Transistors 14 nm bulk silicon 3D transistors (FinFET)
Architecture Skylake x86
Instructions MMX, AES-NI, CLMUL, FMA3
Extensions
Socket(s)
Predecessor
Successor Kaby Lake (Optimization)[7]
Brand name(s)
    • Core i3
    • Core i5
    • Core i7
    • Core m3
    • Core m5
    • Core m7
    • Xeon
    • Pentium

Skylake[8][9] is the codename used by Intel for a processor microarchitecture which was launched in August 2015[10] succeeding the Broadwell microarchitecture.[11] Skylake is a microarchitecture redesign using the same 14 nm manufacturing process technology[12] as its predecessor Broadwell, serving as a "tock" in Intel's "tick-tock" manufacturing and design model. According to Intel, the redesign brings greater CPU and GPU performance and reduced power consumption. It will be succeeded by Kaby Lake and Cannonlake.

Development history

Skylake's development, as with processors such as Banias, Dothan, Conroe, Sandy Bridge and Ivy Bridge, was primarily undertaken by Intel Israel [13] at its engineering research center in Haifa, Israel. The team worked on the project for four years, and faced many challenges: "But by re-writing the microarchitecture and developing new concepts such as the Speed Shift Technology, we created a processor for 4.5 W to 45 W mobile devices, and up to 91 W for desktop devices."[14] The Skylake processors will be used to power a wide range of devices, from smartphones and tablets, all the way to desktops.[15] "Because of Skylake's features, companies will be able to release laptop PCs that are half as thick and half as heavy as those from five years ago," according to Intel.[16]

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. Also, 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 video.[17]

An initial batch of Skylake CPUs (6600K and 6700K) was announced for immediate availability during the Gamescom on August 5, 2015,[1] unusually soon after the release of its predecessor, Broadwell, which had suffered from launch delays.[18] 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;[19] yet, the 14 nm production was back on track and in full production as of Q3 2014.[20] Industry observers had initially believed that the issues impacting 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.[21][22] As a result, the Broadwell architecture had an unusually short run.[21]

Overclocking of unsupported processors

Officially Intel only supported overclocking of the "K" 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 only applying 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.[23][24]

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 which removes the function.[25][26][27] In April 2016 Asrock started selling motherboards which support overclocking of unsupported CPUs using an external clock generator.[28][29]

Operating system support

While Skylake and Kaby Lake CPUs are fully compatible with most existing x86/x86-64 operating systems, full support for all CPU features may vary depending on OS.[30]

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 7.[31][32]

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.[33][34]

On August 11, 2016, Microsoft announced a further reprieve for users of Windows Embedded 7 and 8.x, giving support to the former until January 14, 2020, and to the latter until January, 2023.[35]

As of the 4.5 Linux Kernel, Skylake mobile products are not fully supported, missing support for some Low-Power Idle States. Because of that, long term reliability can be reduced.[36]

Features

Like its predecessor, Broadwell, Skylake is available in four variants, identified by the suffixes "S" (SKL-S), "H" (SKL-H), "U" (SKL-U), and "Y" (SKL-Y). SKL-S contains an overclockable "K" variant with unlocked multipliers.[37] The H, U and Y variants are manufactured in ball grid array (BGA) packaging, while the S variant is manufactured in land grid array (LGA) packaging using a new socket, LGA 1151.[38] Skylake is used in conjunction with Intel 100 Series chipsets, also known as Sunrise Point.[39]

The major changes between the Haswell and Skylake architectures include the removal of the fully integrated voltage regulator (FIVR) introduced with Haswell.[40] 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 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.[38] 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.[41]

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.[42] The Skylake line of processors retires VGA support,[43] while supporting up to five monitors connected via HDMI 1.4, DisplayPort 1.2 or Embedded DisplayPort (eDP) interfaces.[44] HDMI 2.0 (4K@60 Hz) is only supported on motherboards equipped with Intel’s Alpine Ridge Thunderbolt controller.[45]

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").[3][4]

Skylake-based laptops may use wireless technology called Rezence for charging, and other wireless technologies for communication with peripherals. Many major PC vendors have agreed to use this technology in Skylake-based laptops, which should be released by the end of 2015.[46]

The integrated GPU of Skylake's S variant supports DirectX 12 Feature Level 12_1, OpenGL 4.4 and OpenCL 2.0 standards, as well as some modern hardware video encoding/decoding formats such as VP9 (GPU accelerated decode only), VP8 and HEVC (hardware accelerated 8-bit encode/decode and GPU accelerated 10-bit decode).[47][48]

Intel also released unlocked (capable of overclocking) mobile Skylake CPUs.[49]

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.

Architecture

Configurations

Skylake processors are produced in four main families: Y, U, H and S. Multiple configurations are available within each family:[38]

Feature Family
Y U H S
Integrated L4 cache • • •
For lower power consumption mobile or embedded systems • • •
Socketable; for desktop;
some with Configurable thermal design power (cTDP),
selecting 35 W or 95 W modes;
High-performance 95 W TDP version (no L4 cache)		 •
DDR3 SDRAM
(low-power)		 • • • •
DDR4 SDRAM • • •
Smaller than Broadwell counterpart •

List of Skylake processors

Desktop processors

Common features of the desktop Skylake CPUs:

Target
segment		 Cores
(threads)		 Processor
branding and model		 CPU clock rate CPU Turbo clock rate GPU model EUs Max

graphics clock rate

 L1 cache

(data + instruction)

 L2

cache

 L3
cache		 L4 cache (eDRAM) TDP Release
date		 Release
price
(USD)
Single core Dual core Quad core
Performance 4 (8) Core i7 6700K 4.0 GHz 4.2 GHz 4.0 GHz 4.0 GHz HD 530 24 1150 MHz [69] 4× 32 KB +
4× 32 KB 		 4× 256 KB 8 MB - 91 W Aug 5, 2015 $339
6785R 3.3 GHz 3.9 GHz Iris Pro 580 72 128MB 65 W May 3, 2016 $370
6700 3.4 GHz 4.0 GHz 3.9 GHz 3.7 GHz HD 530 24 - Sep 1, 2015 $303
6700T 2.8 GHz 3.6 GHz 3.5 GHz 3.4 GHz 35 W $303
Mainstream 4 (4) Core i5 6600K 3.5 GHz 3.9 GHz 3.8 GHz 3.6 GHz 6 MB 91 W Aug 5, 2015 $242
6685R 3.2 GHz 3.8 GHz Iris Pro 580 72 128MB 65 W May 3, 2016 $288
6600 3.3 GHz 3.9 GHz 3.8 GHz 3.6 GHz HD 530 24 - Sep 1, 2015 $213
6585R 2.8 GHz 3.6 GHz Iris Pro 580 72 1100 MHz 128MB May 3, 2016 $255
6500 3.2 GHz 3.6 GHz 3.5 GHz 3.3 GHz HD 530 24 1050 MHz - Sep 1, 2015 $192
6600T 2.7 GHz 3.5 GHz 3.4 GHz 3.3 GHz 1100 MHz 35 W Q3 2015 $213
6500T 2.5 GHz 3.1 GHz 3.0 GHz 2.8 GHz $192
6402P 2.8 GHz 3.4 GHz 3.4 GHz 3.2 GHz HD 510 12 950 MHz 65 W Dec 27, 2015 $182
6400T 2.2 GHz 2.8 GHz HD 530 24 35 W Q3 2015
6400 2.7 GHz 3.3 GHz 3.3 GHz 3.1 GHz 65 W Aug 5, 2015
2 (4) Core i3 6320 3.9 GHz N/A 1150 MHz 2× 32 KB +
2× 32 KB 		 2× 256 KB 4 MB 51 W TBD $149
6300 3.8 GHz $138
6100 3.7 GHz 1050 MHz 3 MB October 2015 $117
6300T 3.3 GHz 950 MHz 4 MB 35 W $138
6100T 3.2 GHz 3 MB $117
6098P 3.6 GHz HD 510 12 1050 MHz 54 W Dec 27, 2015
2 (2) Pentium G4520 3.6 GHz HD 530 24 51 W October 2015 $86
G4500 3.5 GHz $75
G4500T 3.0 GHz 950 MHz 35 W Q3 2015
G4400 3.3 GHz HD 510 12 1000 MHz 54 W October 2015 $64
G4400T 2.9 GHz 950 MHz 35 W Q3 2015
G4400TE 2.4 GHz Q4 2015 $70
Celeron G3920 2.9 GHz 2 MB 51 W $52
G3900 2.8 GHz $42
G3900TE 2.3 GHz 35 W
G3900T 2.6 GHz ?

Mobile processors (See also "Server, Mobile" below)

Target
segment		 Cores
(threads)		 Processor
branding and
model		 CPU
clock
rate		 CPU Turbo clock rate GPU model GPU clock rate L3
cache		 L4
cache		 Max. PCIe lanes TDP cTDP Release date Price (USD)
Single core Dual core Quad core Base Max Up Down
Performance 4 (8) Core i7 6970HQ 2.8 GHz 3.7 GHz ? Iris Pro 580 350 MHz 1050 MHz 8 MB 128 MB 16 45 W N/A 35 W Q1 2016 $623
6920HQ 2.9 GHz 3.8 GHz 3.6 GHz 3.4 GHz HD 530 N/A September 1, 2015 $568
6870HQ 2.7 GHz 3.6 GHz ? Iris Pro 580 1000 MHz 128 MB Q1 2016 $434
6820HQ 2.7 GHz 3.6 GHz 3.4 GHz 3.2 GHz HD 530 1050 MHz N/A September 1, 2015 $378
6820HK
6770HQ 2.6 GHz 3.5 GHz ? Iris Pro 580 950 MHz 6 MB 128 MB Q1 2016 $434
6700HQ 2.6 GHz 3.5 GHz 3.3 GHz 3.1 GHz HD 530 1050 MHz N/A September 1, 2015 $378
Mainstream 2 (4) 6660U 2.4 GHz 3.4 GHz 3.2 GHz N/A Iris 540 300 MHz 4 MB 64 MB 12 15 W 9.5 W TBD $415
6650U 2.2 GHz Iris 540
6600U 2.6 GHz N/A HD 520 N/A 25 W 7.5 W September 1, 2015 $393
6567U 3.3 GHz 3.6 GHz 3.4 GHz Iris 550 1100 MHz 64 MB 28 W N/A 23 W TBD TBD
6560U 2.2 GHz 3.2 GHz 3.1 GHz Iris 540 1050 MHz 15 W 9.5 W
6500U 2.5 GHz 3.1 GHz 3.0 GHz HD 520 N/A 7.5 W September 1, 2015 $393
4 (4) Core i5 6440HQ 2.6 GHz 3.5 GHz 3.3 GHz 3.1 GHz HD 530 350 MHz 950 MHz 6 MB 16 45 W 35 W $250
2 (4) 6360U 2.0 GHz 3.1 GHz 2.9 GHz N/A Iris 540 300 MHz 1000 MHz 4 MB 64 MB 12 15 W 9.5 W TBD $304
4 (4) 6350HQ 2.3 GHz 3.2 GHz ? Iris Pro 580 350 MHz 900 MHz 6 MB 128 MB 16 45 W 35 W Q1 2016 $306
6300HQ 3.0 GHz 2.8 GHz HD 530 950 MHz N/A September 1, 2015 $250
2 (4) 6300U 2.4 GHz 3.0 GHz 2.9 GHz N/A HD 520 300 MHz 1000 MHz 3 MB 12 15 W 7.5 W $281
6287U 3.1 GHz 3.5 GHz 3.3 GHz Iris 550 1100 MHz 4 MB 64 MB 28 W 23 W TBD $304
6267U 2.9 GHz 3.3 GHz 3.1 GHz 1050 MHz 23 W
6260U 1.8 GHz 2.9 GHz 2.7 GHz Iris 540 950 MHz 15 W 9.5 W TBD $304
6200U 2.3 GHz 2.8 GHz HD 520 1000 MHz 3 MB N/A 7.5 W September 1, 2015 $281
Core i3 6167U 2.7 GHz 2.7 GHz Iris 550 64 MB 28 W 23 W TBD $304
6100H HD 530 350 MHz 900 MHz N/A 35 W N/A September 1, 2015 $225
6100U 2.3 GHz 2.3 GHz 2.3 GHz HD 520 300 MHz 1000 MHz 15 W 7.5 W $281
Core m7 6Y75 1.2 GHz 3.1 GHz 2.9 GHz HD 515 300 MHz 4 MB 10 4.5 W 7 W 3.5 W $393
Core m5 6Y57 1.1 GHz 2.8 GHz 2.4 GHz 900 MHz $281
6Y54 2.7 GHz
Core m3 6Y30 0.9 GHz 2.2 GHz 2.0 GHz 850 MHz 3.8 W
Pentium 4405U 2.1 GHz 2.1 GHz 2.1 GHz HD 510 950 MHz 2 MB 15 W N/A 10 W TBD $161
4405Y 1.5 GHz 1.5 GHz 1.5 GHz HD 515 800 MHz 6 W 4.5 W
2 (2) Celeron G3902E 1.6 GHz N/A HD 510 350 MHz 950 MHz 16 25 W N/A Q1 2016 $107
G3900E 2.4 GHz 35 W
3955U 2.0 GHz 300 MHz 900 MHz 10 15 W 10 W Q4 2015
3855U 1.6 GHz

[70]

Server processors

E3 series server chips all consist of System Bus 9 GT/s, max. memory bandwidth of 34.1 GB/s dual channel memory. Unlike its predecessor, the Skylake Xeon CPUs require either a C232 or a C236 chipset to operate.

Skylake E3-12xx and E3 15xx v5 SKUs
Target
segment		 Cores
(threads)		 Processor
branding and model		 GPU
model		 Clock rate L3
cache		 L4
cache		 TDP Release
date		 Release
price (USD)
tray / box		 Motherboard
CPU Graphics Socket Interface Memory
Normal Turbo Normal Turbo
Server 4 (8) Xeon E3 v5 1280v5 N/A 3.7 GHz 4.0 GHz N/A 8 MB N/A 80 W Q4 15 $612 / — LGA
1151		 DMI 3
PCIe 3.0
DDR4
2133/1866
or
DDR3L
1333/1600
with ECC
1275v5 HD (P530) 3.6 GHz 350 MHz $339 / —
1270v5 N/A 3.6 GHz N/A $328 / $339
1260Lv5 2.9 GHz 3.9 GHz 45 W $294 / —
1245v5 HD (P530) 3.5 GHz 350 MHz 80 W $284 / —
1240v5 N/A 3.5 GHz N/A $272 / $282
1240Lv5 2.1 GHz 3.2 GHz 25 W $278 / —
1230v5 3.4 GHz 3.8 GHz 80 W $250 / $260
4 (4) 1235Lv5 HD (P530) 2 GHz 3 GHz 350 MHz 25 W $250 / —
1225v5 3.3 GHz 3.7 GHz 80 W $213 / —
1220v5 N/A 3 GHz 3.5 GHz N/A $193 / —
Mobile 4 (8) 1575Mv5 Iris Pro 580 3.0 GHz 3.9 GHz 350 MHz 1.1 GHz 128 MB 45 W Q1 16 $1207 / — BGA
1440
DDR4-2133
LPDDR3-1866
DDR3L-1600
with ECC
1545Mv5 2.9 GHz 3.8 GHz 1.05 GHz N/A $679 / —
1535Mv5 HD (P530) 2.9 GHz 3.8 GHz Q3 15 $623 / —
1505Mv5 2.8 GHz 3.7 GHz $434 / —
Server/embedded 1505Lv5 2 GHz 2.8 GHz 1 GHz 25 W Q4 15 $433 / —

See also

References

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  2. ↑ Tom's Hardware: Skylake Xeon Platforms Spotted, Purley Makes A Quiet Splash At Computex. June 3, 2016
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