GeForce GT 645M vs Radeon R9 M275
If you are going to buy a new graphics card and are choosing between GeForce GT 645M and Radeon R9 M275, 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 Radeon R9 M275, check out specs charts below.
GeForce GT 645M and Radeon R9 M275 are Laptop Graphics Cards
Note: GeForce GT 645M and Radeon R9 M275 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 R9 M275 here:
Main Specs
GeForce GT 645M
Radeon R9 M275
Power consumption (TDP)
32 Watt
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
4 GB
Display Connectors
No outputs
No outputs
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Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
Radeon R9 M275 has 2 GB more memory, than GeForce GT 645M.
Both cards are used in Laptops.
GeForce GT 645M is build with Kepler architecture, and Radeon R9 M275 - with GCN.
GeForce GT 645M and Radeon R9 M275 are manufactured by 28 nm process technology.
Memory clock speed of Radeon R9 M275 is 2700 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
0−1
ultra / 1080p
0−1
−
QHD / 1440p
0−1
0−1
low / 720p
12−14
12−14
medium / 1080p
2−3
3−4
The average gaming FPS of Radeon R9 M275 in Assassin's Creed Odyssey is 14% more, than GeForce GT 645M.
high / 1080p
−
5−6
ultra / 1080p
3−4
4−5
QHD / 1440p
0−1
0−1
low / 720p
12−14
16−18
medium / 1080p
4−5
5−6
The average gaming FPS of Radeon R9 M275 in Battlefield 5 is 28% more, than GeForce GT 645M.
low / 768p
50−55
50−55
high / 1080p
45−50
45−50
QHD / 1440p
0−1
0−1
medium / 1080p
−
50−55
GeForce GT 645M and Radeon R9 M275 have the same average FPS in Call of Duty: Warzone.
low / 768p
110−120
110−120
medium / 768p
85−90
90−95
ultra / 1080p
35−40
40−45
QHD / 1440p
−
24−27
4K / 2160p
10−11
18−20
high / 768p
60−65
65−70
The average gaming FPS of Radeon R9 M275 in Counter-Strike: Global Offensive is 8% more, than GeForce GT 645M.
low / 768p
70−75
60−65
ultra / 1080p
14−16
18−20
medium / 1080p
45−50
50−55
The average gaming FPS of GeForce GT 645M in Cyberpunk 2077 is 2% more, than Radeon R9 M275.
low / 768p
70−75
70−75
medium / 768p
45−50
50−55
ultra / 1080p
18−20
24−27
The average gaming FPS of Radeon R9 M275 in Dota 2 is 8% more, than GeForce GT 645M.
high / 1080p
2−3
1−2
ultra / 1080p
2−3
−
4K / 2160p
0−1
0−1
low / 720p
10−11
10−12
medium / 1080p
3−4
3−4
GeForce GT 645M and Radeon R9 M275 have the same average FPS in Far Cry 5.
high / 1080p
−
9−10
ultra / 1080p
5−6
5−6
QHD / 1440p
1−2
1−2
low / 720p
45−50
50−55
medium / 1080p
8−9
12−14
The average gaming FPS of Radeon R9 M275 in Fortnite is 20% more, than GeForce GT 645M.
high / 1080p
3−4
6−7
ultra / 1080p
−
4−5
QHD / 1440p
0−1
0−1
low / 720p
14−16
18−20
medium / 1080p
6−7
7−8
The average gaming FPS of Radeon R9 M275 in Forza Horizon 4 is 37% more, than GeForce GT 645M.
low / 768p
40−45
45−50
high / 1080p
3−4
7−8
ultra / 1080p
2−3
4−5
QHD / 1440p
0−1
0−1
medium / 720p
35−40
35−40
The average gaming FPS of Radeon R9 M275 in Grand Theft Auto V is 14% more, than GeForce GT 645M.
high / 1080p
1−2
3−4
ultra / 1080p
0−1
1−2
4K / 2160p
0−1
0−1
low / 720p
3−4
7−8
medium / 1080p
2−3
4−5
The average gaming FPS of Radeon R9 M275 in Metro Exodus is 150% more, than GeForce GT 645M.
low / 768p
85−90
85−90
high / 1080p
55−60
70−75
The average gaming FPS of Radeon R9 M275 in Minecraft is 11% more, than GeForce GT 645M.
high / 1080p
14−16
14−16
ultra / 1080p
12−14
12−14
low / 720p
24−27
24−27
medium / 1080p
14−16
14−16
GeForce GT 645M and Radeon R9 M275 have the same average FPS in PLAYERUNKNOWN'S BATTLEGROUNDS.
ultra / 1080p
3−4
7−8
QHD / 1440p
0−1
0−1
low / 720p
4−5
8−9
The average gaming FPS of Radeon R9 M275 in Red Dead Redemption 2 is 100% more, than GeForce GT 645M.
low / 768p
8−9
16−18
medium / 768p
7−8
12−14
high / 1080p
3−4
6−7
ultra / 1080p
3−4
5−6
4K / 2160p
0−1
−
The average gaming FPS of Radeon R9 M275 in The Witcher 3: Wild Hunt is 100% more, than GeForce GT 645M.
low / 768p
70−75
85−90
medium / 768p
35−40
35−40
ultra / 1080p
12−14
14−16
high / 768p
30−33
30−33
The average gaming FPS of Radeon R9 M275 in World of Tanks is 10% more, than GeForce GT 645M.
Full Specs
GeForce GT 645M
Radeon R9 M275
Architecture
Kepler
GCN
Code name
N13P-GS
Venus
Type
Laptop
Laptop
Release date
22 March 2012
1 August 2014
Pipelines
384
640
Core clock speed
925 MHz
Boost Clock
925 MHz
Transistor count
1,270 million
1,500 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
22.7 billion/sec
37.00
Floating-point performance
544.5 gflops
1,184 gflops
Memory bus width
128bit
128 Bit
Memory clock speed
1800 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)
19 Mh/s
122 Mh/s
Laptop size
medium sized
large
Optimus
+
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