Intel Iris Plus Graphics 655 vs Intel Iris Plus Graphics 640

Intel Iris Plus Graphics 655

The Intel Iris Plus Graphics 655 (GT3e) is a processor graphics card announced in September 2017. As the successor to the Intel Iris Graphics 650 (Kaby Lake), the Iris Plus Graphics 655 is used for 28-Watt Coffee Lake-U models. The biggest difference is the doubled eDRAM-cache at 128 MB. There should not be any big changes compared to the Iris Graphics 650.

The so called GT3e version of the Kaby Lake GPU still has 48 Execution Units (EUs), which can reach up to 1200 MHz (previously 1100 MHz) depending on the model. Besides eDRAM cache, the Iris 655 can also access the system memory (2x 64 Bit DDR3L-2133/DDR4-2400) via processor interface.

Compared to the Iris Plus 640 from the 15-Watt models, the Iris 655 only has a slightly higher maximum clock as well as almost twice the TDP, which allows a better utilization of the Turbo Boost potential.

Performance

The exact performance of the Iris Plus Graphics 655 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 i7-8559U. Depending on the game, the Iris Plus 655 will probably be on par with a dedicated GeForce 930M or GeForce 940MX and can handle smooth gameplay in modern titles in low up to medium settings.

Features

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.

Power Consumption

The Iris Plus Graphics 655 is used for 28-Watt processor and therefore small/medium-sized notebooks.

Intel Iris Plus Graphics 640

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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.

Performance

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.

Features

Power Consumption

The Iris Plus Graphics 640 is used for 15-Watt ULV processor and therefore thin notebooks and Ultrabooks.

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Intel Iris Plus Graphics 655

Intel Iris Plus Graphics 640

Gen. 9.5 Series

Iris Plus Graphics 655	48 @ 0.3 - 1.2 GHz
Iris Plus Graphics 650	48 @ 0.3 - 1.1 GHz	64/128 Bit
Iris Plus Graphics 645	48 @ 0.3 - 1.15 GHz
Iris Plus Graphics 640	48 @ 0.3 - 1.05 GHz	64/128 Bit
UHD Graphics 630	24 @ 0.3 - 1.15 GHz	64/128 Bit
UHD Graphics P630	24 @ 0.3 - 1.2 GHz	64/128 Bit
HD Graphics 630	24 @ 0.3 - 1.15 GHz	64/128 Bit
HD Graphics P630	24	64/128 Bit
UHD Graphics 620	24 @ 0.3 - 1.15 GHz
HD Graphics 620	24 @ 0.3 - 1.05 GHz	64/128 Bit
UHD Graphics 617	24 @ 0.3 - 1.15 GHz	64/128 Bit
UHD Graphics 615	24 @ 0.3 - 1 GHz	64/128 Bit
HD Graphics 615	24 @ 0.3 - 1.05 GHz	64/128 Bit

Iris Plus Graphics 655	48 @ 0.3 - 1.2 GHz
Iris Plus Graphics 650	48 @ 0.3 - 1.1 GHz	64/128 Bit
Iris Plus Graphics 645	48 @ 0.3 - 1.15 GHz
Iris Plus Graphics 640	48 @ 0.3 - 1.05 GHz	64/128 Bit
UHD Graphics 630	24 @ 0.3 - 1.15 GHz	64/128 Bit
UHD Graphics P630	24 @ 0.3 - 1.2 GHz	64/128 Bit
HD Graphics 630	24 @ 0.3 - 1.15 GHz	64/128 Bit
HD Graphics P630	24	64/128 Bit
UHD Graphics 620	24 @ 0.3 - 1.15 GHz
HD Graphics 620	24 @ 0.3 - 1.05 GHz	64/128 Bit
UHD Graphics 617	24 @ 0.3 - 1.15 GHz	64/128 Bit
UHD Graphics 615	24 @ 0.3 - 1 GHz	64/128 Bit
HD Graphics 615	24 @ 0.3 - 1.05 GHz	64/128 Bit

Codename

Kaby Lake GT3e

Architecture

Gen. 9.5 Kaby Lake

Pipelines

48 - unified

Core Speed

300 - 1200 (Boost) MHz

300 - 1050 (Boost) MHz

Memory Type

DDR3/DDR4

Shared Memory

yes

API

DirectX 12_1, OpenGL 4.5

DirectX 12_1, OpenGL 4.4

technology

14 nm

Features

QuickSync

Date of Announcement

01.09.2017

03.01.2017

Memory Bus Width

64/128 Bit

Max. Amount of Memory

64 MB

CPU in Iris Plus Graphics 655		GPU Base Speed	GPU Boost / Turbo
Intel Core i7-8559U	4 x 2700 MHz, 28 W	300 MHz	1200 MHz
Intel Core i5-8269U	4 x 2600 MHz, 28 W	300 MHz	1100 MHz
Intel Core i5-8279U	4 x 2400 MHz, 28 W	300 MHz	1150 MHz
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Intel Core i5-8259U	4 x 2300 MHz, 28 W	300 MHz	1050 MHz
Intel Core i3-8109U	2 x 3000 MHz, 28 W	300 MHz	1050 MHz
min. - max.		300 MHz	1050 - 1200 MHz

CPU in Iris Plus Graphics 640		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 MHz	950 - 1200 MHz