GeForce GT 640 vs Radeon HD 7770M
When comparing GeForce GT 640 and Radeon HD 7770M, we look primarily at benchmarks and game tests. But it is not only about the numbers. Often you can find third-party models with higher clock speeds, better cooling, or a customizable RGB lighting. Not all of them will have all the features you need. Another thing to consider is the port selection. Most graphics cards have at least one DisplayPort and HDMI interface, but some monitors require DVI. Before you buy, check the TDP of the graphics card - this characteristic will help you estimate the consumption of the graphics card. You may even have to upgrade your PSU to meet its requirements. An important factor when choosing between GeForce GT 640 and Radeon HD 7770M is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
Radeon HD 7770M is a Laptop Graphics Card
Note: Radeon HD 7770M is only used in laptop graphics. It has 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 7770M here:
Main Specs
GeForce GT 640
Radeon HD 7770M
Power consumption (TDP)
65 Watt
32 Watt
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
None
Memory type
DDR3
GDDR5
Maximum RAM amount
2 GB
1 GB
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
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GeForce GT 640 has 103% more power consumption, than Radeon HD 7770M.
GeForce GT 640 is connected by PCIe 3.0 x16, and Radeon HD 7770M uses PCIe 2.0 x16 interface.
GeForce GT 640 has 1 GB more memory, than Radeon HD 7770M.
GeForce GT 640 is used in Desktops, and Radeon HD 7770M - in Laptops.
GeForce GT 640 is build with Kepler architecture, and Radeon HD 7770M - with GCN.
Core clock speed of GeForce GT 640 is 227 MHz higher, than Radeon HD 7770M.
GeForce GT 640 and Radeon HD 7770M are manufactured by 28 nm process technology.
Memory clock speed of Radeon HD 7770M is 2218 MHz higher, than GeForce GT 640.
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
2−3
9−10
ultra / 1080p
1−2
5−6
QHD / 1440p
0−1
0−1
low / 720p
14−16
21−24
medium / 1080p
5−6
10−12
The average gaming FPS of Radeon HD 7770M in Assassin's Creed Odyssey is 100% more, than GeForce GT 640.
high / 1080p
7−8
14−16
ultra / 1080p
5−6
12−14
QHD / 1440p
0−1
0−1
low / 720p
20−22
30−35
medium / 1080p
7−8
16−18
The average gaming FPS of Radeon HD 7770M in Battlefield 5 is 90% more, than GeForce GT 640.
low / 768p
50−55
45−50
high / 1080p
35−40
−
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 640 in Call of Duty: Warzone is 10% more, than Radeon HD 7770M.
low / 768p
110−120
160−170
medium / 768p
90−95
130−140
ultra / 1080p
45−50
65−70
QHD / 1440p
24−27
35−40
4K / 2160p
18−20
27−30
high / 768p
65−70
100−110
The average gaming FPS of Radeon HD 7770M in Counter-Strike: Global Offensive is 45% more, than GeForce GT 640.
low / 768p
70−75
55−60
ultra / 1080p
21−24
24−27
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 640 in Cyberpunk 2077 is 9% more, than Radeon HD 7770M.
low / 768p
70−75
90−95
medium / 768p
50−55
70−75
ultra / 1080p
27−30
40−45
The average gaming FPS of Radeon HD 7770M in Dota 2 is 35% more, than GeForce GT 640.
high / 1080p
3−4
10−12
ultra / 1080p
3−4
10−11
4K / 2160p
2−3
4−5
low / 720p
14−16
24−27
medium / 1080p
4−5
12−14
The average gaming FPS of Radeon HD 7770M in Far Cry 5 is 140% more, than GeForce GT 640.
high / 1080p
10−12
18−20
ultra / 1080p
5−6
12−14
QHD / 1440p
2−3
−
low / 720p
50−55
70−75
medium / 1080p
16−18
30−35
The average gaming FPS of Radeon HD 7770M in Fortnite is 61% more, than GeForce GT 640.
high / 1080p
6−7
16−18
ultra / 1080p
−
14−16
QHD / 1440p
4−5
3−4
4K / 2160p
2−3
−
low / 720p
21−24
30−35
medium / 1080p
9−10
18−20
The average gaming FPS of Radeon HD 7770M in Forza Horizon 4 is 80% more, than GeForce GT 640.
low / 768p
45−50
60−65
medium / 768p
−
55−60
high / 1080p
7−8
18−20
ultra / 1080p
3−4
8−9
QHD / 1440p
0−1
0−1
medium / 720p
40−45
−
The average gaming FPS of Radeon HD 7770M in Grand Theft Auto V is 57% more, than GeForce GT 640.
high / 1080p
2−3
6−7
ultra / 1080p
0−1
4−5
4K / 2160p
0−1
1−2
low / 720p
8−9
18−20
medium / 1080p
4−5
8−9
The average gaming FPS of Radeon HD 7770M in Metro Exodus is 120% more, than GeForce GT 640.
low / 768p
80−85
100−110
high / 1080p
−
95−100
ultra / 1080p
70−75
85−90
medium / 1080p
−
95−100
The average gaming FPS of Radeon HD 7770M in Minecraft is 24% more, than GeForce GT 640.
high / 1080p
−
18−20
ultra / 1080p
12−14
14−16
low / 720p
27−30
40−45
medium / 1080p
14−16
18−20
The average gaming FPS of Radeon HD 7770M in PLAYERUNKNOWN'S BATTLEGROUNDS is 38% more, than GeForce GT 640.
high / 1080p
6−7
12−14
ultra / 1080p
4−5
8−9
QHD / 1440p
0−1
0−1
low / 720p
7−8
16−18
medium / 1080p
−
12−14
The average gaming FPS of Radeon HD 7770M in Red Dead Redemption 2 is 100% more, than GeForce GT 640.
low / 768p
14−16
30−35
medium / 768p
10−11
21−24
high / 1080p
5−6
12−14
ultra / 1080p
4−5
7−8
4K / 2160p
0−1
7−8
The average gaming FPS of Radeon HD 7770M in The Witcher 3: Wild Hunt is 125% more, than GeForce GT 640.
low / 768p
70−75
90−95
medium / 768p
35−40
50−55
ultra / 1080p
16−18
24−27
high / 768p
30−35
40−45
The average gaming FPS of Radeon HD 7770M in World of Tanks is 35% more, than GeForce GT 640.
Full Specs
GeForce GT 640
Radeon HD 7770M
Architecture
Kepler
GCN
Code name
GK107
Chelsea XT
Type
Desktop
Laptop
Release date
5 June 2012
24 April 2012
Pipelines
384
512
Core clock speed
902 MHz
675 MHz
Transistor count
1,270 million
1,500 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
28.86
21.60
Floating-point performance
692.7 gflops
691.2 gflops
Length
145 mm
Memory bus width
128 Bit
128 Bit
Memory clock speed
1782 MHz
4000 MHz
Memory bandwidth
28.51 GB/s
64 GB/s
Shared memory
-
DirectX
12 (11_0)
12 (11_1)
Shader Model
5.1
5.1
OpenGL
4.6
4.6
OpenCL
1.2
1.2
Vulkan
1.1.126
1.2.131
CUDA
3.0
Bitcoin / BTC (SHA256)
24 Mh/s
Laptop size
medium sized
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