GeForce GT 640 vs GeForce GTX 660M
Find out if it is worth upgrading your current GPU setup by comparing GeForce GT 640 and GeForce GTX 660M. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce GT 640 and GeForce GTX 660M. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.
GeForce GTX 660M is a Laptop Graphics Card
Note: GeForce GTX 660M 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 GTX 660M here:
Main Specs
GeForce GT 640
GeForce GTX 660M
Power consumption (TDP)
65 Watt
50 Watt
Interface
PCIe 3.0 x16
MXM-B (3.0)
Supplementary power connectors
None
Memory type
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 30% more power consumption, than GeForce GTX 660M.
GeForce GT 640 is connected by PCIe 3.0 x16, and GeForce GTX 660M uses MXM-B (3.0) interface.
GeForce GT 640 and GeForce GTX 660M have maximum RAM of 2 GB.
GeForce GT 640 is used in Desktops, and GeForce GTX 660M - in Laptops.
GeForce GT 640 and GeForce GTX 660M are build with Kepler architecture.
Core clock speed of GeForce GT 640 is 67 MHz higher, than GeForce GTX 660M.
GeForce GT 640 and GeForce GTX 660M are manufactured by 28 nm process technology.
Memory clock speed of GeForce GTX 660M is 218 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
6−7
ultra / 1080p
1−2
4−5
QHD / 1440p
0−1
0−1
low / 720p
14−16
16−18
medium / 1080p
5−6
8−9
The average gaming FPS of GeForce GTX 660M in Assassin's Creed Odyssey is 50% more, than GeForce GT 640.
high / 1080p
7−8
12−14
ultra / 1080p
5−6
10−11
QHD / 1440p
0−1
0−1
low / 720p
20−22
24−27
medium / 1080p
7−8
12−14
The average gaming FPS of GeForce GTX 660M in Battlefield 5 is 50% more, than GeForce GT 640.
low / 768p
50−55
45−50
high / 1080p
35−40
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GTX 660M in Call of Duty: Warzone is 4% more, than GeForce GT 640.
low / 768p
110−120
130−140
medium / 768p
90−95
110−120
ultra / 1080p
45−50
50−55
QHD / 1440p
24−27
27−30
4K / 2160p
18−20
27−30
high / 768p
65−70
80−85
The average gaming FPS of GeForce GTX 660M in Counter-Strike: Global Offensive is 19% more, than GeForce GT 640.
low / 768p
70−75
55−60
ultra / 1080p
21−24
18−20
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 640 in Cyberpunk 2077 is 14% more, than GeForce GTX 660M.
low / 768p
70−75
80−85
medium / 768p
50−55
55−60
ultra / 1080p
27−30
30−35
The average gaming FPS of GeForce GTX 660M in Dota 2 is 11% more, than GeForce GT 640.
high / 1080p
3−4
8−9
ultra / 1080p
3−4
7−8
4K / 2160p
2−3
3−4
low / 720p
14−16
18−20
medium / 1080p
4−5
8−9
The average gaming FPS of GeForce GTX 660M in Far Cry 5 is 80% more, than GeForce GT 640.
high / 1080p
10−12
14−16
ultra / 1080p
5−6
10−11
QHD / 1440p
2−3
−
low / 720p
50−55
60−65
medium / 1080p
16−18
21−24
The average gaming FPS of GeForce GTX 660M in Fortnite is 28% more, than GeForce GT 640.
high / 1080p
6−7
12−14
ultra / 1080p
−
10−12
QHD / 1440p
4−5
1−2
4K / 2160p
2−3
−
low / 720p
21−24
24−27
medium / 1080p
9−10
14−16
The average gaming FPS of GeForce GTX 660M in Forza Horizon 4 is 30% more, than GeForce GT 640.
low / 768p
45−50
50−55
medium / 768p
−
45−50
high / 1080p
7−8
12−14
ultra / 1080p
3−4
6−7
QHD / 1440p
0−1
0−1
medium / 720p
40−45
−
The average gaming FPS of GeForce GTX 660M in Grand Theft Auto V is 26% more, than GeForce GT 640.
high / 1080p
2−3
4−5
ultra / 1080p
0−1
3−4
4K / 2160p
0−1
0−1
low / 720p
8−9
12−14
medium / 1080p
4−5
6−7
The average gaming FPS of GeForce GTX 660M in Metro Exodus is 60% more, than GeForce GT 640.
low / 768p
80−85
95−100
high / 1080p
−
90−95
ultra / 1080p
70−75
80−85
medium / 1080p
−
90−95
The average gaming FPS of GeForce GTX 660M in Minecraft is 16% more, than GeForce GT 640.
high / 1080p
−
16−18
ultra / 1080p
12−14
14−16
low / 720p
27−30
30−35
medium / 1080p
14−16
18−20
The average gaming FPS of GeForce GTX 660M in PLAYERUNKNOWN'S BATTLEGROUNDS is 22% more, than GeForce GT 640.
high / 1080p
6−7
−
ultra / 1080p
4−5
7−8
QHD / 1440p
0−1
0−1
low / 720p
7−8
12−14
medium / 1080p
−
10−12
The average gaming FPS of GeForce GTX 660M in Red Dead Redemption 2 is 66% more, than GeForce GT 640.
low / 768p
14−16
24−27
medium / 768p
10−11
16−18
high / 1080p
5−6
9−10
ultra / 1080p
4−5
6−7
4K / 2160p
0−1
6−7
The average gaming FPS of GeForce GTX 660M in The Witcher 3: Wild Hunt is 75% more, than GeForce GT 640.
low / 768p
70−75
85−90
medium / 768p
35−40
45−50
ultra / 1080p
16−18
18−20
high / 768p
30−35
35−40
The average gaming FPS of GeForce GTX 660M in World of Tanks is 20% more, than GeForce GT 640.
Full Specs
GeForce GT 640
GeForce GTX 660M
Architecture
Kepler
Kepler
Code name
GK107
N13E-GE
Type
Desktop
Laptop
Release date
5 June 2012
22 March 2012
Pipelines
384
384
Core clock speed
902 MHz
835 MHz
Boost Clock
950 MHz
Transistor count
1,270 million
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
28.86
30.4 billion/sec
Floating-point performance
692.7 gflops
729.6 gflops
Length
145 mm
Memory bus width
128 Bit
128bit
Memory clock speed
1782 MHz
2000 MHz
Memory bandwidth
28.51 GB/s
64.0 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
SLI options
+
HDMI
+
HDCP
+
Maximum VGA resolution
Up to 2048x1536
Bitcoin / BTC (SHA256)
24 Mh/s
36 Mh/s
Laptop size
large
Optimus
+
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