GeForce GT 645M vs Iris Plus Graphics 640
If you are going to buy a new graphics card and are choosing between GeForce GT 645M and Iris Plus Graphics 640, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce GT 645M stacks up against Iris Plus Graphics 640, check out specs charts below.
GeForce GT 645M and Iris Plus Graphics 640 are Laptop Graphics Cards
Note: GeForce GT 645M and Iris Plus Graphics 640 are only used in laptop graphics. They have lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with GeForce GT 645M or Iris Plus Graphics 640 here:
Main Specs
GeForce GT 645M
Iris Plus Graphics 640
Power consumption (TDP)
32 Watt
15 Watt
Interface
PCIe 3.0 x16
PCIe 3.0 x1
Memory type
DDR3\GDDR5
DDR3L/LPDDR3/DDR4
Maximum RAM amount
2 GB
32 GB
Display Connectors
No outputs
No outputs
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GeForce GT 645M has 113% more power consumption, than Iris Plus Graphics 640.
GeForce GT 645M is connected by PCIe 3.0 x16, and Iris Plus Graphics 640 uses PCIe 3.0 x1 interface.
Iris Plus Graphics 640 has 30 GB more memory, than GeForce GT 645M.
Both cards are used in Laptops.
GeForce GT 645M is build with Kepler architecture, and Iris Plus Graphics 640 - with Gen. 9.5 Kaby Lake.
GeForce GT 645M is manufactured by 28 nm process technology, and Iris Plus Graphics 640 - by 14 nm process technology.
Game benchmarks
Assassin's Creed Odyssey
Battlefield 5
Call of Duty: Warzone
Counter-Strike: Global Offensive
Cyberpunk 2077
Dota 2
Far Cry 5
Fortnite
Forza Horizon 4
Grand Theft Auto V
Metro Exodus
Minecraft
PLAYERUNKNOWN'S BATTLEGROUNDS
Red Dead Redemption 2
The Witcher 3: Wild Hunt
World of Tanks
high / 1080p
1−2
6−7
ultra / 1080p
0−1
4−5
QHD / 1440p
0−1
0−1
low / 720p
12−14
16−18
medium / 1080p
2−3
8−9
The average gaming FPS of Iris Plus Graphics 640 in Assassin's Creed Odyssey is 100% more, than GeForce GT 645M.
high / 1080p
−
12−14
ultra / 1080p
3−4
10−11
QHD / 1440p
0−1
0−1
low / 720p
12−14
24−27
medium / 1080p
4−5
12−14
The average gaming FPS of Iris Plus Graphics 640 in Battlefield 5 is 128% more, than GeForce GT 645M.
low / 768p
50−55
45−50
high / 1080p
45−50
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 645M in Call of Duty: Warzone is 6% more, than Iris Plus Graphics 640.
low / 768p
110−120
130−140
medium / 768p
85−90
110−120
ultra / 1080p
35−40
50−55
QHD / 1440p
−
27−30
4K / 2160p
10−11
27−30
high / 768p
60−65
80−85
The average gaming FPS of Iris Plus Graphics 640 in Counter-Strike: Global Offensive is 32% more, than GeForce GT 645M.
low / 768p
70−75
55−60
ultra / 1080p
14−16
18−20
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 645M in Cyberpunk 2077 is 9% more, than Iris Plus Graphics 640.
low / 768p
70−75
80−85
medium / 768p
45−50
55−60
ultra / 1080p
18−20
30−35
The average gaming FPS of Iris Plus Graphics 640 in Dota 2 is 23% more, than GeForce GT 645M.
high / 1080p
2−3
8−9
ultra / 1080p
2−3
7−8
4K / 2160p
0−1
3−4
low / 720p
10−11
18−20
medium / 1080p
3−4
8−9
The average gaming FPS of Iris Plus Graphics 640 in Far Cry 5 is 150% more, than GeForce GT 645M.
high / 1080p
−
14−16
ultra / 1080p
5−6
10−11
QHD / 1440p
1−2
−
low / 720p
45−50
60−65
medium / 1080p
8−9
21−24
The average gaming FPS of Iris Plus Graphics 640 in Fortnite is 55% more, than GeForce GT 645M.
high / 1080p
3−4
12−14
ultra / 1080p
−
10−12
QHD / 1440p
0−1
1−2
low / 720p
14−16
24−27
medium / 1080p
6−7
14−16
The average gaming FPS of Iris Plus Graphics 640 in Forza Horizon 4 is 112% more, than GeForce GT 645M.
low / 768p
40−45
50−55
medium / 768p
−
45−50
high / 1080p
3−4
12−14
ultra / 1080p
2−3
6−7
QHD / 1440p
0−1
0−1
medium / 720p
35−40
−
The average gaming FPS of Iris Plus Graphics 640 in Grand Theft Auto V is 50% more, than GeForce GT 645M.
high / 1080p
1−2
4−5
ultra / 1080p
0−1
3−4
4K / 2160p
0−1
0−1
low / 720p
3−4
12−14
medium / 1080p
2−3
6−7
The average gaming FPS of Iris Plus Graphics 640 in Metro Exodus is 300% more, than GeForce GT 645M.
low / 768p
85−90
95−100
high / 1080p
55−60
90−95
ultra / 1080p
−
80−85
medium / 1080p
−
90−95
The average gaming FPS of Iris Plus Graphics 640 in Minecraft is 31% more, than GeForce GT 645M.
high / 1080p
14−16
16−18
ultra / 1080p
12−14
14−16
low / 720p
24−27
30−35
medium / 1080p
14−16
18−20
The average gaming FPS of Iris Plus Graphics 640 in PLAYERUNKNOWN'S BATTLEGROUNDS is 17% more, than GeForce GT 645M.
ultra / 1080p
3−4
7−8
QHD / 1440p
0−1
0−1
low / 720p
4−5
12−14
medium / 1080p
−
10−12
The average gaming FPS of Iris Plus Graphics 640 in Red Dead Redemption 2 is 150% more, than GeForce GT 645M.
low / 768p
8−9
24−27
medium / 768p
7−8
16−18
high / 1080p
3−4
9−10
ultra / 1080p
3−4
6−7
4K / 2160p
0−1
6−7
The average gaming FPS of Iris Plus Graphics 640 in The Witcher 3: Wild Hunt is 180% more, than GeForce GT 645M.
low / 768p
70−75
85−90
medium / 768p
35−40
45−50
ultra / 1080p
12−14
18−20
high / 768p
30−33
35−40
The average gaming FPS of Iris Plus Graphics 640 in World of Tanks is 23% more, than GeForce GT 645M.
Full Specs
GeForce GT 645M
Iris Plus Graphics 640
Architecture
Kepler
Gen. 9.5 Kaby Lake
Code name
N13P-GS
Kaby Lake GT3e
Type
Laptop
Laptop
Release date
22 March 2012
3 January 2017
Pipelines
384
48
Core clock speed
300 MHz
Boost Clock
1050 MHz
Transistor count
1,270 million
189 million
Manufacturing process technology
28 nm
14 nm
Texture fill rate
22.7 billion/sec
52.80
Floating-point performance
544.5 gflops
Memory bus width
128bit
64/128 Bit
Memory clock speed
1800 MHz
Shared memory
-
+
DirectX
12 API
12 (12_1)
Shader Model
5.1
6.4
OpenGL
4.5
4.6
OpenCL
1.1
2.1
Vulkan
1.1.126
1.1.103
CUDA
+
CUDA cores
384
Bus support
PCI Express 2.0, PCI Express 3.0
HDMI
+
HDCP
+
Maximum VGA resolution
Up to 2048x1536
3D Blu-Ray
+
Bitcoin / BTC (SHA256)
19 Mh/s
Laptop size
medium sized
Optimus
+
Quick Sync
+
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