Radeon HD 8790M vs Radeon RX 640
When choosing between Radeon HD 8790M and Radeon RX 640, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between Radeon HD 8790M and Radeon RX 640.
Radeon HD 8790M and Radeon RX 640 are Laptop Graphics Cards
Note: Radeon HD 8790M and Radeon RX 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 Radeon HD 8790M or Radeon RX 640 here:
Main Specs
Radeon HD 8790M
Radeon RX 640
Power consumption (TDP)
50 Watt
Interface
MXM-A (3.0)
PCIe 3.0 x8
Supplementary power connectors
None
None
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
4 GB
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x DisplayPort
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Radeon HD 8790M is connected by MXM-A (3.0), and Radeon RX 640 uses PCIe 3.0 x8 interface.
Radeon RX 640 has 2 GB more memory, than Radeon HD 8790M.
Both cards are used in Laptops.
Radeon HD 8790M is build with GCN architecture, and Radeon RX 640 - with Polaris.
Core clock speed of Radeon RX 640 is 368 MHz higher, than Radeon HD 8790M.
Radeon HD 8790M is manufactured by 28 nm process technology, and Radeon RX 640 - by 14 nm process technology.
Memory clock speed of Radeon RX 640 is 1500 MHz higher, than Radeon HD 8790M.
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
3−4
5−6
ultra / 1080p
1−2
3−4
QHD / 1440p
0−1
2−3
low / 720p
14−16
16−18
medium / 1080p
6−7
7−8
The average gaming FPS of Radeon RX 640 in Assassin's Creed Odyssey is 33% more, than Radeon HD 8790M.
high / 1080p
8−9
10−12
ultra / 1080p
6−7
8−9
QHD / 1440p
0−1
0−1
low / 720p
21−24
24−27
medium / 1080p
9−10
10−12
The average gaming FPS of Radeon RX 640 in Battlefield 5 is 27% more, than Radeon HD 8790M.
low / 768p
45−50
45−50
high / 1080p
40−45
40−45
QHD / 1440p
0−1
0−1
Radeon HD 8790M and Radeon RX 640 have the same average FPS in Call of Duty: Warzone.
low / 768p
120−130
130−140
medium / 768p
100−110
100−110
ultra / 1080p
50−55
50−55
QHD / 1440p
24−27
27−30
4K / 2160p
−
12−14
high / 768p
75−80
80−85
The average gaming FPS of Radeon RX 640 in Counter-Strike: Global Offensive is 3% more, than Radeon HD 8790M.
low / 768p
70−75
50−55
ultra / 1080p
21−24
18−20
medium / 1080p
40−45
45−50
The average gaming FPS of Radeon HD 8790M in Cyberpunk 2077 is 15% more, than Radeon RX 640.
low / 768p
75−80
80−85
medium / 768p
55−60
55−60
ultra / 1080p
30−35
30−35
The average gaming FPS of Radeon RX 640 in Dota 2 is 3% more, than Radeon HD 8790M.
high / 1080p
4−5
7−8
ultra / 1080p
4−5
5−6
4K / 2160p
1−2
5−6
low / 720p
14−16
18−20
medium / 1080p
6−7
8−9
The average gaming FPS of Radeon RX 640 in Far Cry 5 is 50% more, than Radeon HD 8790M.
high / 1080p
12−14
7−8
ultra / 1080p
7−8
0−1
QHD / 1440p
4−5
0−1
low / 720p
60−65
60−65
medium / 1080p
18−20
18−20
The average gaming FPS of Radeon HD 8790M in Fortnite is 6% more, than Radeon RX 640.
high / 1080p
8−9
10−11
ultra / 1080p
7−8
−
QHD / 1440p
0−1
−
4K / 2160p
−
8−9
low / 720p
21−24
24−27
medium / 1080p
10−11
12−14
The average gaming FPS of Radeon RX 640 in Forza Horizon 4 is 23% more, than Radeon HD 8790M.
low / 768p
50−55
50−55
high / 1080p
10−11
10−12
ultra / 1080p
4−5
5−6
QHD / 1440p
0−1
−
medium / 720p
40−45
45−50
The average gaming FPS of Radeon RX 640 in Grand Theft Auto V is 7% more, than Radeon HD 8790M.
high / 1080p
2−3
3−4
ultra / 1080p
0−1
1−2
4K / 2160p
0−1
−
low / 720p
9−10
10−11
medium / 1080p
4−5
5−6
The average gaming FPS of Radeon RX 640 in Metro Exodus is 20% more, than Radeon HD 8790M.
low / 768p
85−90
90−95
high / 1080p
70−75
−
ultra / 1080p
−
80−85
The average gaming FPS of Radeon RX 640 in Minecraft is 5% more, than Radeon HD 8790M.
high / 1080p
−
6−7
ultra / 1080p
12−14
2−3
4K / 2160p
−
0−1
low / 720p
30−35
27−30
medium / 1080p
14−16
10−11
The average gaming FPS of Radeon HD 8790M in PLAYERUNKNOWN'S BATTLEGROUNDS is 53% more, than Radeon RX 640.
high / 1080p
7−8
−
ultra / 1080p
4−5
−
QHD / 1440p
0−1
−
low / 720p
8−9
10−12
medium / 1080p
8−9
9−10
The average gaming FPS of Radeon RX 640 in Red Dead Redemption 2 is 25% more, than Radeon HD 8790M.
low / 768p
20−22
21−24
medium / 768p
12−14
14−16
high / 1080p
7−8
6−7
ultra / 1080p
5−6
4−5
4K / 2160p
1−2
3−4
The average gaming FPS of Radeon RX 640 in The Witcher 3: Wild Hunt is 11% more, than Radeon HD 8790M.
low / 768p
75−80
75−80
medium / 768p
40−45
40−45
ultra / 1080p
18−20
18−20
high / 768p
30−35
35−40
The average gaming FPS of Radeon RX 640 in World of Tanks is 4% more, than Radeon HD 8790M.
Full Specs
Radeon HD 8790M
Radeon RX 640
Architecture
GCN
Polaris
Code name
Mars XTX
Polaris 12
Type
Laptop
Laptop
Release date
16 November 2012
12 August 2019
Pipelines
384
640
Core clock speed
850 MHz
1218 MHz
Boost Clock
900 MHz
1218 MHz
Transistor count
950 million
2,200 million
Manufacturing process technology
28 nm
14 nm
Texture fill rate
21.60
38.98
Floating-point performance
691.2 gflops
Memory bus width
128 Bit
64 Bit
Memory clock speed
4500 MHz
6000 MHz
Memory bandwidth
64 GB/s
112.0 GB/s
Shared memory
-
-
DirectX
12 (11_1)
12 (12_0)
Shader Model
5.1
6.4
OpenGL
4.6
4.6
OpenCL
1.2
2.0
Vulkan
1.2.131
1.2.131
FreeSync
+
Bitcoin / BTC (SHA256)
80 Mh/s
Laptop size
medium sized
large
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