GeForce GT 640M vs Radeon HD 8790M
If you are going to buy a new graphics card and are choosing between GeForce GT 640M and Radeon HD 8790M, 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 640M stacks up against Radeon HD 8790M, check out specs charts below.
GeForce GT 640M and Radeon HD 8790M are Laptop Graphics Cards
Note: GeForce GT 640M and Radeon HD 8790M 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 640M or Radeon HD 8790M here:
Main Specs
GeForce GT 640M
Radeon HD 8790M
Power consumption (TDP)
32 Watt
Interface
PCIe 3.0 x16
MXM-A (3.0)
Supplementary power connectors
None
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Display Connectors
No outputs
No outputs
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GeForce GT 640M is connected by PCIe 3.0 x16, and Radeon HD 8790M uses MXM-A (3.0) interface.
GeForce GT 640M and Radeon HD 8790M have maximum RAM of 2 GB.
Both cards are used in Laptops.
GeForce GT 640M is build with Kepler architecture, and Radeon HD 8790M - with GCN.
GeForce GT 640M and Radeon HD 8790M are manufactured by 28 nm process technology.
Memory clock speed of Radeon HD 8790M is 2700 MHz higher, than GeForce GT 640M.
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
0−1
3−4
ultra / 1080p
0−1
1−2
QHD / 1440p
0−1
0−1
low / 720p
10−12
14−16
medium / 1080p
2−3
6−7
The average gaming FPS of Radeon HD 8790M in Assassin's Creed Odyssey is 66% more, than GeForce GT 640M.
high / 1080p
−
8−9
ultra / 1080p
3−4
6−7
QHD / 1440p
0−1
0−1
low / 720p
12−14
21−24
medium / 1080p
4−5
9−10
The average gaming FPS of Radeon HD 8790M in Battlefield 5 is 71% more, than GeForce GT 640M.
low / 768p
50−55
45−50
high / 1080p
45−50
40−45
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 640M in Call of Duty: Warzone is 11% more, than Radeon HD 8790M.
low / 768p
110−120
120−130
medium / 768p
85−90
100−110
ultra / 1080p
35−40
50−55
QHD / 1440p
−
24−27
4K / 2160p
10−11
−
high / 768p
55−60
75−80
The average gaming FPS of Radeon HD 8790M in Counter-Strike: Global Offensive is 21% more, than GeForce GT 640M.
low / 768p
70−75
70−75
ultra / 1080p
12−14
21−24
medium / 1080p
45−50
40−45
The average gaming FPS of Radeon HD 8790M in Cyberpunk 2077 is 2% more, than GeForce GT 640M.
low / 768p
70−75
75−80
medium / 768p
40−45
55−60
ultra / 1080p
18−20
30−35
The average gaming FPS of Radeon HD 8790M in Dota 2 is 25% more, than GeForce GT 640M.
high / 1080p
2−3
4−5
ultra / 1080p
2−3
4−5
4K / 2160p
0−1
1−2
low / 720p
9−10
14−16
medium / 1080p
3−4
6−7
The average gaming FPS of Radeon HD 8790M in Far Cry 5 is 75% more, than GeForce GT 640M.
high / 1080p
−
12−14
ultra / 1080p
5−6
7−8
QHD / 1440p
1−2
4−5
low / 720p
45−50
60−65
medium / 1080p
7−8
18−20
The average gaming FPS of Radeon HD 8790M in Fortnite is 53% more, than GeForce GT 640M.
high / 1080p
2−3
8−9
ultra / 1080p
−
7−8
QHD / 1440p
0−1
0−1
low / 720p
14−16
21−24
medium / 1080p
5−6
10−11
The average gaming FPS of Radeon HD 8790M in Forza Horizon 4 is 85% more, than GeForce GT 640M.
low / 768p
40−45
50−55
high / 1080p
3−4
10−11
ultra / 1080p
2−3
4−5
QHD / 1440p
0−1
0−1
medium / 720p
30−35
40−45
The average gaming FPS of Radeon HD 8790M in Grand Theft Auto V is 35% more, than GeForce GT 640M.
high / 1080p
1−2
2−3
ultra / 1080p
0−1
0−1
4K / 2160p
0−1
0−1
low / 720p
2−3
9−10
medium / 1080p
2−3
4−5
The average gaming FPS of Radeon HD 8790M in Metro Exodus is 150% more, than GeForce GT 640M.
low / 768p
85−90
85−90
high / 1080p
55−60
70−75
The average gaming FPS of Radeon HD 8790M in Minecraft is 11% more, than GeForce GT 640M.
high / 1080p
14−16
−
ultra / 1080p
12−14
12−14
low / 720p
24−27
30−35
medium / 1080p
14−16
14−16
The average gaming FPS of Radeon HD 8790M in PLAYERUNKNOWN'S BATTLEGROUNDS is 17% more, than GeForce GT 640M.
high / 1080p
−
7−8
ultra / 1080p
3−4
4−5
QHD / 1440p
0−1
0−1
low / 720p
3−4
8−9
medium / 1080p
−
8−9
The average gaming FPS of Radeon HD 8790M in Red Dead Redemption 2 is 100% more, than GeForce GT 640M.
low / 768p
7−8
20−22
medium / 768p
6−7
12−14
high / 1080p
3−4
7−8
ultra / 1080p
−
5−6
4K / 2160p
0−1
1−2
The average gaming FPS of Radeon HD 8790M in The Witcher 3: Wild Hunt is 160% more, than GeForce GT 640M.
low / 768p
70−75
75−80
medium / 768p
35−40
40−45
ultra / 1080p
12−14
18−20
high / 768p
27−30
30−35
The average gaming FPS of Radeon HD 8790M in World of Tanks is 13% more, than GeForce GT 640M.
Full Specs
GeForce GT 640M
Radeon HD 8790M
Architecture
Kepler
GCN
Code name
N13P-GS
Mars XTX
Type
Laptop
Laptop
Release date
22 March 2012
16 November 2012
Pipelines
384
384
Core clock speed
850 MHz
Boost Clock
645 MHz
900 MHz
Transistor count
1,270 million
950 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
21.60
Floating-point performance
480.0 gflops
691.2 gflops
Memory bus width
128bit
128 Bit
Memory clock speed
1800 - 4000 MHz
4500 MHz
Memory bandwidth
64 GB/s
Shared memory
-
-
DirectX
12 API
12 (11_1)
Shader Model
5.1
5.1
OpenGL
4.5
4.6
OpenCL
1.1
1.2
Vulkan
1.1.126
1.2.131
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)
18 Mh/s
80 Mh/s
Laptop size
medium sized
medium sized
Optimus
+
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