Intel Skylake Processors To Integrate Iris GT4e Level Graphics Chip – Features 72 Execution Units and Up To 128 MB eDRAM LLC

Hassan Mujtaba

A few weeks ago, specifications of Intel's Broadwell-U series lineup were leaked which detailed the HD Graphics 6100 series chipset codenamed Iris. Being the flagship iGPU chip of Intel's Broadwell lineup, the GT3e chip will be replaced by the more powerful GT4e when Skylake hits the market later next year.Intel Skylake Roadmap

Intel's Next Gen Skylake CPUs To Integrate GT4e Graphics Chip With 72 EUs

The information comes from Zauba (via Computerbase) who had listed several of Intel Skylake series chips in a shipping manifesto along with some key details of the processors. Previously, Zauba has given details of a few NVIDIA graphics cards related to GK110 and GM204 which turned out to be accurate so let's get on with the details. As we previously detailed, Broadwell will feature four iGPU configurations which include GT1, GT2, GT3 and GT3e.

The GT3e “Iris Pro” level graphics chipsets which include the HD 6100 “Iris” GT3e with 48 Execution Units and 128 MB eDRAM cache, The GT3 HD 6000 comes with 48 Execution units and no L4 cache, HD 5300/5500 GT2 graphics chip with 24 Execution units and GT1 HD Graphics chip with just 12 Execution units. Broadwell has increased the EU count by 50% and there are seven H/W threads per EU with 128 GRF registers per thread along with simultaneous multi-threading support.

While Broadwell has already launched with the Core M "Broadwell-Y" series processors, the real chips will start shipping at CES 2015 where Broadwell-U series will enter the market. Broadwell K-Series is being planned for a Q2 2015 launch but at the same time, Intel has announced Skylake-S series which will be available to consumer market featuring lower TDPs. The Skylake-S series chips will be part of a diverse desktop and notebook based platform but being based on a 14 nm process node, Skylake processors would feature a new architecture along with several CPU and GPU side enhancements whereas Broadwell is meant to improve upon the architecture which was first introduced on Haswell processors. The following chart shows the main differences in the next generation Skylake processor configurations:

Intel 14nm Skylake Configuration Table
Cores Configurations 2 2 / 2 4 / 4 4 / 2 / 4
Graphic Configurations GT1 12 EUs
GT 1.5 18 EUs GT2 24 EUs
GT2 24 EUs / GT3e 48 EUs GT2 24 EUs / GT4e 72 EUs GT2 24 EUs / GT2 24 EUs/ GT4e 72 EUs
eDRAM - 64MB – GT3e 128MB – GT4e 64MB – GT4e
Memory LPDDR3 1600Mhz LPDDR3 1600Mhz DDR4 2133Mhz DDR3L/DDR3L-RS 1600Mhz, DDR4 2133Mhz
TDP 4W 15-28W 35-45W 35-95W

Compared to Haswell and Broadwell, we are looking at some decent extension in the number of Execution Units till the GT3 iGPU but the GT4e is way beyond the GT3e chips with 72 Execution Units. The chip will be featured across the Syklake S/H/K series processors with 64 MB eDRAM cache on LGA variants and 128 MB eDRAM cache on BGA variants.

Aside from all these details, the SKUs for Skylake have also been confirmed along with their TDPs. The desktop variants will have six different variants which will include the flagship 95W Quad Cores with GT2 and GT4e GPU while the lowest 35W TDP variant will feature Dual Cores and GT2 graphics. The H-Series lineup will also include the 95W Quad Core with GT4e graphics chip but that’s the only flagship chip followed by 65W, 55W and 45W Quad Core variants with a mix of GT4e and GT2 graphics. This H-Series doesn’t seem to include a dual core model at all. The U-Series lineup will have TDPs of 25W and 15W with the flagship part featuring Dual Cores and GT3e graphics while the other models consist of GT2 graphics. Last up is the Y-Series Skylake lineup featuring two SKUs, both featuring 4.5W TDP and 2 Cores plus GT2 graphics.

Broadwell will stick to the LGA 1150 socket and remain compatible with current 9-Series chipset motherboards while Skylake will shift focus to the next mainstream chipset known as the Z170. The chipset will feature up to 20 PCIe Gen 3 lanes, 6 SATA Gen 3 ports, 10 USB 3.0 ports and a total of 14 total USB ports (USB 3.0 / USB 2.0), up to 3 SATA Express capable ports, up to 3 Intel RST capable PCI-e storage ports which may include x2 SATA Express or M.2 SSD port with Enhanced SPI and x4/x8/x16 capable Gen 3 PCI-Express support from the processor. Aside from that, we know that the Skylake processors would be compatible with the latest LGA 1151 socketed boards and Z170 chipset which is part of the new 100-Series chipset replacing the 9-Series “Wild Cat” PCH. The second most interesting thing covered is that Skylake processors would have both DDR3 and DDR4 memory controllers so the different SKUs can be configured to use either of the memory type.

The difference between them is not clearly mentioned however we think its related to clock speeds. You can get a better representation of the variants in the following chart:

SKUs x86 Cores Graphics TDP
Skylake DT 4 GT4e 95W
Skylake DT 4 GT2 95W
Skylake DT 4 GT2 65W
Skylake DT 2 GT2 65W
Skylake DT 2 GT2 35W
Skylake DT 4 GT2 35W
H-Series 4 GT43 95W
H-Series 4 GT4e 65W
H-Series 4 GT4e 55W
H-Series 4 GT4e 45W
H-Series 4 GT2 65W
H-Series 4 GT2 55W
H-Series 4 GT2 45W
U-Series 2 GT3e 25W
U-Series 2 GT3e 15W
U-Series 2 GT2 25W
U-Series 2 GT2 15W
Y-Series A 2 GT2 4.5W
Y-Series B 2 GT2 4.5W

Intel Mainstream Platforms Comparison Chart:

Intel Sandy Bridge Platform Intel Ivy Bridge Platform Intel Haswell Platform Intel Broadwell Platform Intel Skylake Platform Intel Cannonlake Platform
Processor Architecture Sandy Bridge Ivy Bridge Haswell Broadwell Skylake Cannonlake
Processor Process 32nm 22nm 22nm 14nm 14nm 10nm
Processors Cores (Max) 4 4 4 4 4 TBA
Platform Chipset 6-Series “Cougar Point” 7-Series “Panther Point” 8-Series “Lynx Point” 9-Series “Wild Cat Point” 100-Series “Sunrise Point” 200-Series “Union Point”
Platform Socket LGA 1155 LGA 1155 LGA 1150 LGA 1150 LGA 1151 TBA
Memory Support DDR3 DDR3 DDR3 DDR3 DDR4 / DDR3 DDR4
Thunderbolt Yes Yes Yes Yes Yes “Alpine Ridge” Yes
Platform Desktop LGA Desktop LGA Desktop LGA Desktop LGA Desktop LGA Desktop LGA
Launch 2011 2012 2013-2014 2015 2015 2016
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