GeForce GT 640M vs GeForce GT 645M
If you are going to buy a new graphics card and are choosing between GeForce GT 640M and GeForce GT 645M, 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 GeForce GT 645M, check out specs charts below.
GeForce GT 640M and GeForce GT 645M are Laptop Graphics Cards
Note: GeForce GT 640M and GeForce GT 645M 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 GeForce GT 645M here:
Main Specs
GeForce GT 640M
GeForce GT 645M
Power consumption (TDP)
32 Watt
32 Watt
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Memory type
DDR3\GDDR5
DDR3\GDDR5
Maximum RAM amount
2 GB
2 GB
Display Connectors
No outputs
No outputs
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Both graphics cards have the same power consumption of 32 Watt.
Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
GeForce GT 640M and GeForce GT 645M have maximum RAM of 2 GB.
Both cards are used in Laptops.
GeForce GT 640M and GeForce GT 645M are build with Kepler architecture.
GeForce GT 640M and GeForce GT 645M are manufactured by 28 nm process technology.
Memory clock speed of GeForce GT 640M and GeForce GT 645M is 1800 MHz.
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
1−2
ultra / 1080p
0−1
0−1
QHD / 1440p
0−1
0−1
low / 720p
10−12
12−14
medium / 1080p
2−3
2−3
The average gaming FPS of GeForce GT 645M in Assassin's Creed Odyssey is 16% more, than GeForce GT 640M.
ultra / 1080p
3−4
3−4
QHD / 1440p
0−1
0−1
low / 720p
12−14
12−14
medium / 1080p
4−5
4−5
GeForce GT 640M and GeForce GT 645M have the same average FPS in Battlefield 5.
low / 768p
50−55
50−55
high / 1080p
45−50
45−50
QHD / 1440p
0−1
0−1
GeForce GT 640M and GeForce GT 645M have the same average FPS in Call of Duty: Warzone.
low / 768p
110−120
110−120
medium / 768p
85−90
85−90
ultra / 1080p
35−40
35−40
4K / 2160p
10−11
10−11
high / 768p
55−60
60−65
The average gaming FPS of GeForce GT 645M in Counter-Strike: Global Offensive is 1% more, than GeForce GT 640M.
low / 768p
70−75
70−75
ultra / 1080p
12−14
14−16
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 645M in Cyberpunk 2077 is 2% more, than GeForce GT 640M.
low / 768p
70−75
70−75
medium / 768p
40−45
45−50
ultra / 1080p
18−20
18−20
The average gaming FPS of GeForce GT 645M in Dota 2 is 4% more, than GeForce GT 640M.
high / 1080p
2−3
2−3
ultra / 1080p
2−3
2−3
4K / 2160p
0−1
0−1
low / 720p
9−10
10−11
medium / 1080p
3−4
3−4
GeForce GT 640M and GeForce GT 645M have the same average FPS in Far Cry 5.
ultra / 1080p
5−6
5−6
QHD / 1440p
1−2
1−2
low / 720p
45−50
45−50
medium / 1080p
7−8
8−9
GeForce GT 640M and GeForce GT 645M have the same average FPS in Fortnite.
high / 1080p
2−3
3−4
QHD / 1440p
0−1
0−1
low / 720p
14−16
14−16
medium / 1080p
5−6
6−7
The average gaming FPS of GeForce GT 645M in Forza Horizon 4 is 14% more, than GeForce GT 640M.
low / 768p
40−45
40−45
high / 1080p
3−4
3−4
ultra / 1080p
2−3
2−3
QHD / 1440p
0−1
0−1
medium / 720p
30−35
35−40
The average gaming FPS of GeForce GT 645M in Grand Theft Auto V is 5% more, than GeForce GT 640M.
high / 1080p
1−2
1−2
ultra / 1080p
0−1
0−1
4K / 2160p
0−1
0−1
low / 720p
2−3
3−4
medium / 1080p
2−3
2−3
GeForce GT 640M and GeForce GT 645M have the same average FPS in Metro Exodus.
low / 768p
85−90
85−90
high / 1080p
55−60
55−60
GeForce GT 640M and GeForce GT 645M have the same average FPS in Minecraft.
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 640M and GeForce GT 645M have the same average FPS in PLAYERUNKNOWN'S BATTLEGROUNDS.
ultra / 1080p
3−4
3−4
QHD / 1440p
0−1
0−1
low / 720p
3−4
4−5
The average gaming FPS of GeForce GT 645M in Red Dead Redemption 2 is 33% more, than GeForce GT 640M.
low / 768p
7−8
8−9
medium / 768p
6−7
7−8
high / 1080p
3−4
3−4
ultra / 1080p
−
3−4
4K / 2160p
0−1
0−1
The average gaming FPS of GeForce GT 645M in The Witcher 3: Wild Hunt is 20% more, than GeForce GT 640M.
low / 768p
70−75
70−75
medium / 768p
35−40
35−40
ultra / 1080p
12−14
12−14
high / 768p
27−30
30−33
The average gaming FPS of GeForce GT 645M in World of Tanks is 2% more, than GeForce GT 640M.
Full Specs
GeForce GT 640M
GeForce GT 645M
Architecture
Kepler
Kepler
Code name
N13P-GS
N13P-GS
Type
Laptop
Laptop
Release date
22 March 2012
22 March 2012
Pipelines
384
384
Boost Clock
645 MHz
Transistor count
1,270 million
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
22.7 billion/sec
Floating-point performance
480.0 gflops
544.5 gflops
Memory bus width
128bit
128bit
Memory clock speed
1800 - 4000 MHz
1800 MHz
Shared memory
-
-
DirectX
12 API
12 API
Shader Model
5.1
5.1
OpenGL
4.5
4.5
OpenCL
1.1
1.1
Vulkan
1.1.126
1.1.126
CUDA
+
+
CUDA cores
384
384
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
HDMI
+
+
HDCP
+
+
Maximum VGA resolution
Up to 2048x1536
Up to 2048x1536
3D Blu-Ray
+
+
Bitcoin / BTC (SHA256)
18 Mh/s
19 Mh/s
Laptop size
medium sized
medium sized
Optimus
+
+
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