GeForce GT 645M vs Radeon HD 7770M
When choosing between GeForce GT 645M and Radeon HD 7770M, 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 GeForce GT 645M and Radeon HD 7770M.
GeForce GT 645M and Radeon HD 7770M are Laptop Graphics Cards
Note: GeForce GT 645M and Radeon HD 7770M 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 Radeon HD 7770M here:
Main Specs
GeForce GT 645M
Radeon HD 7770M
Power consumption (TDP)
32 Watt
32 Watt
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
1 GB
Display Connectors
No outputs
No outputs
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Both graphics cards have the same power consumption of 32 Watt.
GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon HD 7770M uses PCIe 2.0 x16 interface.
GeForce GT 645M has 1 GB more memory, than Radeon HD 7770M.
Both cards are used in Laptops.
GeForce GT 645M is build with Kepler architecture, and Radeon HD 7770M - with GCN.
GeForce GT 645M and Radeon HD 7770M are manufactured by 28 nm process technology.
Memory clock speed of Radeon HD 7770M is 2200 MHz higher, than GeForce GT 645M.
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
9−10
ultra / 1080p
0−1
5−6
QHD / 1440p
0−1
0−1
low / 720p
12−14
21−24
medium / 1080p
2−3
10−12
The average gaming FPS of Radeon HD 7770M in Assassin's Creed Odyssey is 180% more, than GeForce GT 645M.
high / 1080p
−
14−16
ultra / 1080p
3−4
12−14
QHD / 1440p
0−1
0−1
low / 720p
12−14
30−35
medium / 1080p
4−5
16−18
The average gaming FPS of Radeon HD 7770M in Battlefield 5 is 185% more, than GeForce GT 645M.
low / 768p
50−55
45−50
high / 1080p
45−50
−
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 645M in Call of Duty: Warzone is 10% more, than Radeon HD 7770M.
low / 768p
110−120
160−170
medium / 768p
85−90
130−140
ultra / 1080p
35−40
65−70
QHD / 1440p
−
35−40
4K / 2160p
10−11
27−30
high / 768p
60−65
100−110
The average gaming FPS of Radeon HD 7770M in Counter-Strike: Global Offensive is 61% more, than GeForce GT 645M.
low / 768p
70−75
55−60
ultra / 1080p
14−16
24−27
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 645M in Cyberpunk 2077 is 4% more, than Radeon HD 7770M.
low / 768p
70−75
90−95
medium / 768p
45−50
70−75
ultra / 1080p
18−20
40−45
The average gaming FPS of Radeon HD 7770M in Dota 2 is 50% more, than GeForce GT 645M.
high / 1080p
2−3
10−12
ultra / 1080p
2−3
10−11
4K / 2160p
0−1
4−5
low / 720p
10−11
24−27
medium / 1080p
3−4
12−14
The average gaming FPS of Radeon HD 7770M in Far Cry 5 is 275% more, than GeForce GT 645M.
high / 1080p
−
18−20
ultra / 1080p
5−6
12−14
QHD / 1440p
1−2
−
low / 720p
45−50
70−75
medium / 1080p
8−9
30−35
The average gaming FPS of Radeon HD 7770M in Fortnite is 95% more, than GeForce GT 645M.
high / 1080p
3−4
16−18
ultra / 1080p
−
14−16
QHD / 1440p
0−1
3−4
low / 720p
14−16
30−35
medium / 1080p
6−7
18−20
The average gaming FPS of Radeon HD 7770M in Forza Horizon 4 is 175% more, than GeForce GT 645M.
low / 768p
40−45
60−65
medium / 768p
−
55−60
high / 1080p
3−4
18−20
ultra / 1080p
2−3
8−9
QHD / 1440p
0−1
0−1
medium / 720p
35−40
−
The average gaming FPS of Radeon HD 7770M in Grand Theft Auto V is 87% more, than GeForce GT 645M.
high / 1080p
1−2
6−7
ultra / 1080p
0−1
4−5
4K / 2160p
0−1
1−2
low / 720p
3−4
18−20
medium / 1080p
2−3
8−9
The average gaming FPS of Radeon HD 7770M in Metro Exodus is 450% more, than GeForce GT 645M.
low / 768p
85−90
100−110
high / 1080p
55−60
95−100
ultra / 1080p
−
85−90
medium / 1080p
−
95−100
The average gaming FPS of Radeon HD 7770M in Minecraft is 40% more, than GeForce GT 645M.
high / 1080p
14−16
18−20
ultra / 1080p
12−14
14−16
low / 720p
24−27
40−45
medium / 1080p
14−16
18−20
The average gaming FPS of Radeon HD 7770M in PLAYERUNKNOWN'S BATTLEGROUNDS is 35% more, than GeForce GT 645M.
high / 1080p
−
12−14
ultra / 1080p
3−4
8−9
QHD / 1440p
0−1
0−1
low / 720p
4−5
16−18
medium / 1080p
−
12−14
The average gaming FPS of Radeon HD 7770M in Red Dead Redemption 2 is 200% more, than GeForce GT 645M.
low / 768p
8−9
30−35
medium / 768p
7−8
21−24
high / 1080p
3−4
12−14
ultra / 1080p
3−4
7−8
4K / 2160p
0−1
7−8
The average gaming FPS of Radeon HD 7770M in The Witcher 3: Wild Hunt is 260% more, than GeForce GT 645M.
low / 768p
70−75
90−95
medium / 768p
35−40
50−55
ultra / 1080p
12−14
24−27
high / 768p
30−33
40−45
The average gaming FPS of Radeon HD 7770M in World of Tanks is 39% more, than GeForce GT 645M.
Full Specs
GeForce GT 645M
Radeon HD 7770M
Architecture
Kepler
GCN
Code name
N13P-GS
Chelsea XT
Type
Laptop
Laptop
Release date
22 March 2012
24 April 2012
Pipelines
384
512
Core clock speed
675 MHz
Transistor count
1,270 million
1,500 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
22.7 billion/sec
21.60
Floating-point performance
544.5 gflops
691.2 gflops
Memory bus width
128bit
128 Bit
Memory clock speed
1800 MHz
4000 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)
19 Mh/s
Laptop size
medium sized
medium sized
Optimus
+
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