GeForce GT 640M vs GeForce GT 755M SLI
If you are going to buy a new graphics card and are choosing between GeForce GT 640M and GeForce GT 755M SLI, 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 755M SLI, check out specs charts below.
GeForce GT 640M and GeForce GT 755M SLI are Laptop Graphics Cards
Note: GeForce GT 640M and GeForce GT 755M SLI 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 755M SLI here:
Main Specs
GeForce GT 640M
GeForce GT 755M SLI
Power consumption (TDP)
32 Watt
2x ~50 Watt
Interface
PCIe 3.0 x16
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
2x 2 GB
Display Connectors
No outputs
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GeForce GT 640M has 1500% more power consumption, than GeForce GT 755M SLI.
GeForce GT 640M and GeForce GT 755M SLI have maximum RAM of 2 GB.
Both cards are used in Laptops.
GeForce GT 640M and GeForce GT 755M SLI are build with Kepler architecture.
GeForce GT 640M and GeForce GT 755M SLI are manufactured by 28 nm process technology.
Memory clock speed of GeForce GT 755M SLI is 3600 MHz higher, than GeForce GT 640M.
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
14−16
ultra / 1080p
0−1
8−9
QHD / 1440p
0−1
2−3
low / 720p
10−12
30−35
medium / 1080p
2−3
18−20
The average gaming FPS of GeForce GT 755M SLI in Assassin's Creed Odyssey is 316% more, than GeForce GT 640M.
high / 1080p
−
21−24
ultra / 1080p
3−4
18−20
QHD / 1440p
0−1
2−3
low / 720p
12−14
50−55
medium / 1080p
4−5
24−27
The average gaming FPS of GeForce GT 755M SLI in Battlefield 5 is 357% more, than GeForce GT 640M.
low / 768p
50−55
50−55
high / 1080p
45−50
45−50
QHD / 1440p
0−1
0−1
GeForce GT 640M and GeForce GT 755M SLI have the same average FPS in Call of Duty: Warzone.
low / 768p
110−120
200−210
medium / 768p
85−90
170−180
ultra / 1080p
35−40
90−95
QHD / 1440p
−
50−55
4K / 2160p
10−11
24−27
high / 768p
55−60
140−150
The average gaming FPS of GeForce GT 755M SLI in Counter-Strike: Global Offensive is 109% more, than GeForce GT 640M.
low / 768p
70−75
60−65
ultra / 1080p
12−14
40−45
medium / 1080p
45−50
55−60
The average gaming FPS of GeForce GT 755M SLI in Cyberpunk 2077 is 22% more, than GeForce GT 640M.
low / 768p
70−75
110−120
medium / 768p
40−45
95−100
ultra / 1080p
18−20
60−65
The average gaming FPS of GeForce GT 755M SLI in Dota 2 is 106% more, than GeForce GT 640M.
high / 1080p
2−3
16−18
ultra / 1080p
2−3
14−16
4K / 2160p
0−1
5−6
low / 720p
9−10
35−40
medium / 1080p
3−4
18−20
The average gaming FPS of GeForce GT 755M SLI in Far Cry 5 is 450% more, than GeForce GT 640M.
high / 1080p
−
24−27
ultra / 1080p
5−6
18−20
QHD / 1440p
1−2
12−14
low / 720p
45−50
95−100
medium / 1080p
7−8
50−55
The average gaming FPS of GeForce GT 755M SLI in Fortnite is 200% more, than GeForce GT 640M.
high / 1080p
2−3
24−27
ultra / 1080p
−
18−20
QHD / 1440p
0−1
7−8
low / 720p
14−16
50−55
medium / 1080p
5−6
27−30
The average gaming FPS of GeForce GT 755M SLI in Forza Horizon 4 is 400% more, than GeForce GT 640M.
low / 768p
40−45
85−90
medium / 768p
−
75−80
high / 1080p
3−4
27−30
ultra / 1080p
2−3
10−12
QHD / 1440p
0−1
1−2
medium / 720p
30−35
−
The average gaming FPS of GeForce GT 755M SLI in Grand Theft Auto V is 162% more, than GeForce GT 640M.
high / 1080p
1−2
9−10
ultra / 1080p
0−1
7−8
4K / 2160p
0−1
0−1
low / 720p
2−3
27−30
medium / 1080p
2−3
12−14
The average gaming FPS of GeForce GT 755M SLI in Metro Exodus is 750% more, than GeForce GT 640M.
low / 768p
85−90
110−120
high / 1080p
55−60
−
ultra / 1080p
−
100−110
medium / 1080p
−
100−110
The average gaming FPS of GeForce GT 755M SLI in Minecraft is 32% more, than GeForce GT 640M.
high / 1080p
14−16
−
ultra / 1080p
12−14
14−16
low / 720p
24−27
55−60
medium / 1080p
14−16
18−20
The average gaming FPS of GeForce GT 755M SLI in PLAYERUNKNOWN'S BATTLEGROUNDS is 76% more, than GeForce GT 640M.
high / 1080p
−
12−14
ultra / 1080p
3−4
8−9
QHD / 1440p
0−1
0−1
low / 720p
3−4
27−30
medium / 1080p
−
16−18
The average gaming FPS of GeForce GT 755M SLI in Red Dead Redemption 2 is 500% more, than GeForce GT 640M.
low / 768p
7−8
50−55
medium / 768p
6−7
30−35
high / 1080p
3−4
18−20
ultra / 1080p
−
10−11
4K / 2160p
0−1
6−7
The average gaming FPS of GeForce GT 755M SLI in The Witcher 3: Wild Hunt is 580% more, than GeForce GT 640M.
low / 768p
70−75
90−95
medium / 768p
35−40
60−65
ultra / 1080p
12−14
30−35
high / 768p
27−30
50−55
The average gaming FPS of GeForce GT 755M SLI in World of Tanks is 62% more, than GeForce GT 640M.
Full Specs
GeForce GT 640M
GeForce GT 755M SLI
Architecture
Kepler
Kepler
Code name
N13P-GS
N14P-?
Type
Laptop
Laptop
Release date
22 March 2012
1 November 2013
Pipelines
384
768
Core clock speed
980 MHz
Boost Clock
645 MHz
Transistor count
1,270 million
2x 1300 Million
Manufacturing process technology
28 nm
28 nm
Floating-point performance
480.0 gflops
Memory bus width
128bit
2x 128 Bit
Memory clock speed
1800 - 4000 MHz
5400 MHz
Shared memory
-
-
DirectX
12 API
DirectX 11, Shader 5.0
Shader Model
5.1
OpenGL
4.5
OpenCL
1.1
Vulkan
1.1.126
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)
18 Mh/s
Laptop size
medium sized
large
Optimus
+
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