GeForce GT 640 vs GeForce GT 645M
If you are going to buy a new graphics card and are choosing between GeForce GT 640 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 640 stacks up against GeForce GT 645M, check out specs charts below.
GeForce GT 645M is a Laptop Graphics Card
Note: GeForce GT 645M 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 GeForce GT 645M here:
Main Specs
GeForce GT 640
GeForce GT 645M
Power consumption (TDP)
65 Watt
32 Watt
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
None
Memory type
DDR3
DDR3\GDDR5
Maximum RAM amount
2 GB
2 GB
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
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GeForce GT 640 has 103% more power consumption, than GeForce GT 645M.
Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
GeForce GT 640 and GeForce GT 645M have maximum RAM of 2 GB.
GeForce GT 640 is used in Desktops, and GeForce GT 645M - in Laptops.
GeForce GT 640 and GeForce GT 645M are build with Kepler architecture.
GeForce GT 640 and GeForce GT 645M are manufactured by 28 nm process technology.
Memory clock speed of GeForce GT 645M is 18 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
1−2
ultra / 1080p
1−2
0−1
QHD / 1440p
0−1
0−1
low / 720p
14−16
12−14
medium / 1080p
5−6
2−3
The average gaming FPS of GeForce GT 640 in Assassin's Creed Odyssey is 40% more, than GeForce GT 645M.
high / 1080p
7−8
−
ultra / 1080p
5−6
3−4
QHD / 1440p
0−1
0−1
low / 720p
20−22
12−14
medium / 1080p
7−8
4−5
The average gaming FPS of GeForce GT 640 in Battlefield 5 is 57% more, than GeForce GT 645M.
low / 768p
50−55
50−55
high / 1080p
35−40
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 645M in Call of Duty: Warzone is 11% more, than GeForce GT 640.
low / 768p
110−120
110−120
medium / 768p
90−95
85−90
ultra / 1080p
45−50
35−40
QHD / 1440p
24−27
−
4K / 2160p
18−20
10−11
high / 768p
65−70
60−65
The average gaming FPS of GeForce GT 640 in Counter-Strike: Global Offensive is 9% more, than GeForce GT 645M.
low / 768p
70−75
70−75
ultra / 1080p
21−24
14−16
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 640 in Cyberpunk 2077 is 4% more, than GeForce GT 645M.
low / 768p
70−75
70−75
medium / 768p
50−55
45−50
ultra / 1080p
27−30
18−20
The average gaming FPS of GeForce GT 640 in Dota 2 is 10% more, than GeForce GT 645M.
high / 1080p
3−4
2−3
ultra / 1080p
3−4
2−3
4K / 2160p
2−3
0−1
low / 720p
14−16
10−11
medium / 1080p
4−5
3−4
The average gaming FPS of GeForce GT 640 in Far Cry 5 is 50% more, than GeForce GT 645M.
high / 1080p
10−12
−
ultra / 1080p
5−6
5−6
QHD / 1440p
2−3
1−2
low / 720p
50−55
45−50
medium / 1080p
16−18
8−9
The average gaming FPS of GeForce GT 640 in Fortnite is 26% more, than GeForce GT 645M.
high / 1080p
6−7
3−4
QHD / 1440p
4−5
0−1
4K / 2160p
2−3
−
low / 720p
21−24
14−16
medium / 1080p
9−10
6−7
The average gaming FPS of GeForce GT 640 in Forza Horizon 4 is 50% more, than GeForce GT 645M.
low / 768p
45−50
40−45
high / 1080p
7−8
3−4
ultra / 1080p
3−4
2−3
QHD / 1440p
0−1
0−1
medium / 720p
40−45
35−40
The average gaming FPS of GeForce GT 640 in Grand Theft Auto V is 19% more, than GeForce GT 645M.
high / 1080p
2−3
1−2
ultra / 1080p
0−1
0−1
4K / 2160p
0−1
0−1
low / 720p
8−9
3−4
medium / 1080p
4−5
2−3
The average gaming FPS of GeForce GT 640 in Metro Exodus is 150% more, than GeForce GT 645M.
low / 768p
80−85
85−90
high / 1080p
−
55−60
ultra / 1080p
70−75
−
The average gaming FPS of GeForce GT 645M in Minecraft is 6% more, than GeForce GT 640.
high / 1080p
−
14−16
ultra / 1080p
12−14
12−14
low / 720p
27−30
24−27
medium / 1080p
14−16
14−16
The average gaming FPS of GeForce GT 640 in PLAYERUNKNOWN'S BATTLEGROUNDS is 5% more, than GeForce GT 645M.
high / 1080p
6−7
−
ultra / 1080p
4−5
3−4
QHD / 1440p
0−1
0−1
low / 720p
7−8
4−5
The average gaming FPS of GeForce GT 640 in Red Dead Redemption 2 is 50% more, than GeForce GT 645M.
low / 768p
14−16
8−9
medium / 768p
10−11
7−8
high / 1080p
5−6
3−4
ultra / 1080p
4−5
3−4
4K / 2160p
0−1
0−1
The average gaming FPS of GeForce GT 640 in The Witcher 3: Wild Hunt is 60% more, than GeForce GT 645M.
low / 768p
70−75
70−75
medium / 768p
35−40
35−40
ultra / 1080p
16−18
12−14
high / 768p
30−35
30−33
The average gaming FPS of GeForce GT 640 in World of Tanks is 2% more, than GeForce GT 645M.
Full Specs
GeForce GT 640
GeForce GT 645M
Architecture
Kepler
Kepler
Code name
GK107
N13P-GS
Type
Desktop
Laptop
Release date
5 June 2012
22 March 2012
Pipelines
384
384
Core clock speed
902 MHz
Transistor count
1,270 million
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
28.86
22.7 billion/sec
Floating-point performance
692.7 gflops
544.5 gflops
Length
145 mm
Memory bus width
128 Bit
128bit
Memory clock speed
1782 MHz
1800 MHz
Memory bandwidth
28.51 GB/s
Shared memory
-
DirectX
12 (11_0)
12 API
Shader Model
5.1
5.1
OpenGL
4.6
4.5
OpenCL
1.2
1.1
Vulkan
1.1.126
1.1.126
CUDA
3.0
+
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)
24 Mh/s
19 Mh/s
Laptop size
medium sized
Optimus
+
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