Intel Iris Plus Graphics 640
The Intel Iris Plus Graphics 640 (GT3e) is a processor graphics card for Kaby Lake models announced in January 2017. As the successor to the Intel Iris Graphics 540 (Skylake), the Iris Plus Graphics 640 is used for 15-Watt ULV models and is equipped with 64 MB eDRAM cache. There should not be any big changes compared to the Iris Graphics 540.
The so called GT3e version of the Kaby Lake GPU still has 48 Execution Units (EUs), which can reach up to 1050 MHz depending on the model. Besides eDRAM cache, the Iris 640 can also access the system memory (2x 64 Bit DDR3L-1600/LPDDR3-1866/DDR4-2400) via processor interface.
Compared to the Iris Plus 650 from the 28-Watt models, the Iris 640 only has a slightly lower maximum clock as well as the lower TDP, so the utilization of the Turbo Boost potential should be worse.
The exact performance of the Iris Plus Graphics 640 depends on the CPU model, because maximum clock as well as the size of the L3 cache can differ a bit. The system memory (DDR3/DDR4) will influence the performance as well.
The fastest chips are high-clocked Core i7 models like the Core i7-7660U. Depending on the game, the Iris Plus 640 will probably be similar to the previous model somewhere between a dedicated GeForce 920M and GeForce 940M and is usually limited to low settings in modern games.
The reworked video engine now fully supports hardware decoding of H.265/HEVC videos. Contrary to Skylake, however, Kaby Lake can now also decode H.265/HEVC Main 10 with a 10-bit color depth as well as Google's VP9 codec. The video output is possible via DP 1.2/eDP 1.3 (up to 3840 x 2160 @60 Hz), whereas HDMI is also supported in the older 1.4a standard. An HDMI 2.0 output can be added via converter from DisplayPort. The GPU can drive up to three displays simultaneously.
The Iris Plus Graphics 640 is used for 15-Watt ULV processor and therefore thin notebooks and Ultrabooks.
|Gen. 9.5 Series|
|Codename||Kaby Lake GT3e|
|Architecture||Intel Gen. 9.5 (Kaby Lake)|
|Pipelines||48 - unified|
|Core Speed *||300 - 1050 (Boost) MHz|
|Memory Bus Width||64/128 Bit|
|Max. Amount of Memory||64 MB|
|DirectX||DirectX 12 (FL 12_1)|
|Date of Announcement||03.01.2017|
|CPU||GPU Base Speed||GPU Boost / Turbo|
|Intel Core i7-7660U||2 x 2500 MHz, 15 W||300 MHz||1050 MHz|
|Intel Core i7-7560U||2 x 2400 MHz, 15 W||300 MHz||1050 MHz|
|Intel Core i5-7360U||2 x 2300 MHz, 15 W||300 MHz||1000 MHz|
|Intel Core i5-7260U||2 x 2200 MHz, 15 W||300 MHz||950 MHz|
|min. - max.||300 - 300 MHz||950 - 1050 MHz|
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