GeForce 920MX vs GeForce GT 640
If you are going to buy a new graphics card and are choosing between GeForce 920MX and GeForce GT 640, 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 920MX stacks up against GeForce GT 640, check out specs charts below.
GeForce 920MX is a Laptop Graphics Card
Note: GeForce 920MX 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 920MX here:
Main Specs
GeForce 920MX
GeForce GT 640
Power consumption (TDP)
16 Watt
65 Watt
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Supplementary power connectors
None
None
Memory type
DDR3, GDDR5
DDR3
Maximum RAM amount
2 GB
2 GB
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x DisplayPort
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GeForce GT 640 has 306% more power consumption, than GeForce 920MX.
GeForce 920MX is connected by PCIe 3.0 x8, and GeForce GT 640 uses PCIe 3.0 x16 interface.
GeForce 920MX and GeForce GT 640 have maximum RAM of 2 GB.
GeForce 920MX is used in Laptops, and GeForce GT 640 - in Desktops.
GeForce 920MX is build with Maxwell architecture, and GeForce GT 640 - with Kepler.
Core clock speed of GeForce 920MX is 63 MHz higher, than GeForce GT 640.
GeForce 920MX and GeForce GT 640 are manufactured by 28 nm process technology.
Memory clock speed of GeForce 920MX 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
2−3
ultra / 1080p
0−1
1−2
QHD / 1440p
0−1
0−1
low / 720p
12−14
14−16
medium / 1080p
3−4
5−6
The average gaming FPS of GeForce GT 640 in Assassin's Creed Odyssey is 16% more, than GeForce 920MX.
high / 1080p
−
7−8
ultra / 1080p
4−5
5−6
QHD / 1440p
0−1
0−1
low / 720p
16−18
20−22
medium / 1080p
6−7
7−8
The average gaming FPS of GeForce GT 640 in Battlefield 5 is 22% more, than GeForce 920MX.
low / 768p
45−50
50−55
high / 1080p
40−45
35−40
QHD / 1440p
0−1
0−1
GeForce 920MX and GeForce GT 640 have the same average FPS in Call of Duty: Warzone.
low / 768p
120−130
110−120
medium / 768p
95−100
90−95
ultra / 1080p
40−45
45−50
QHD / 1440p
24−27
24−27
4K / 2160p
18−20
18−20
high / 768p
70−75
65−70
The average gaming FPS of GeForce 920MX in Counter-Strike: Global Offensive is 3% more, than GeForce GT 640.
low / 768p
85−90
70−75
ultra / 1080p
18−20
21−24
medium / 1080p
40−45
45−50
The average gaming FPS of GeForce 920MX in Cyberpunk 2077 is 4% more, than GeForce GT 640.
low / 768p
75−80
70−75
medium / 768p
50−55
50−55
ultra / 1080p
24−27
27−30
GeForce 920MX and GeForce GT 640 have the same average FPS in Dota 2.
high / 1080p
2−3
3−4
ultra / 1080p
2−3
3−4
4K / 2160p
1−2
2−3
low / 720p
12−14
14−16
medium / 1080p
3−4
4−5
The average gaming FPS of GeForce GT 640 in Far Cry 5 is 25% more, than GeForce 920MX.
high / 1080p
10−11
10−12
ultra / 1080p
5−6
5−6
QHD / 1440p
2−3
2−3
low / 720p
50−55
50−55
medium / 1080p
12−14
16−18
The average gaming FPS of GeForce GT 640 in Fortnite is 6% more, than GeForce 920MX.
high / 1080p
5−6
6−7
QHD / 1440p
0−1
4−5
4K / 2160p
−
2−3
low / 720p
18−20
21−24
medium / 1080p
7−8
9−10
The average gaming FPS of GeForce GT 640 in Forza Horizon 4 is 20% more, than GeForce 920MX.
low / 768p
45−50
45−50
high / 1080p
5−6
7−8
ultra / 1080p
2−3
3−4
QHD / 1440p
0−1
0−1
medium / 720p
35−40
40−45
The average gaming FPS of GeForce GT 640 in Grand Theft Auto V is 8% more, than GeForce 920MX.
high / 1080p
1−2
2−3
ultra / 1080p
0−1
0−1
4K / 2160p
0−1
0−1
low / 720p
6−7
8−9
medium / 1080p
3−4
4−5
The average gaming FPS of GeForce GT 640 in Metro Exodus is 66% more, than GeForce 920MX.
low / 768p
90−95
80−85
high / 1080p
85−90
−
ultra / 1080p
70−75
70−75
medium / 1080p
90−95
−
The average gaming FPS of GeForce 920MX in Minecraft is 6% more, than GeForce GT 640.
ultra / 1080p
12−14
12−14
low / 720p
27−30
27−30
medium / 1080p
14−16
14−16
GeForce 920MX and GeForce GT 640 have the same average FPS in PLAYERUNKNOWN'S BATTLEGROUNDS.
high / 1080p
−
6−7
ultra / 1080p
4−5
4−5
QHD / 1440p
0−1
0−1
low / 720p
6−7
7−8
The average gaming FPS of GeForce GT 640 in Red Dead Redemption 2 is 20% more, than GeForce 920MX.
low / 768p
12−14
14−16
medium / 768p
9−10
10−11
high / 1080p
4−5
5−6
ultra / 1080p
3−4
4−5
4K / 2160p
0−1
0−1
The average gaming FPS of GeForce GT 640 in The Witcher 3: Wild Hunt is 14% more, than GeForce 920MX.
low / 768p
75−80
70−75
medium / 768p
35−40
35−40
ultra / 1080p
16−18
16−18
high / 768p
30−35
30−35
The average gaming FPS of GeForce 920MX in World of Tanks is 5% more, than GeForce GT 640.
Full Specs
GeForce 920MX
GeForce GT 640
Architecture
Maxwell
Kepler
Code name
N16V-GMR
GK107
Type
Laptop
Desktop
Release date
25 March 2015
5 June 2012
Pipelines
256
384
Core clock speed
965 MHz
902 MHz
Boost Clock
993 MHz
Transistor count
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
23.83
28.86
Floating-point performance
602.1 gflops
692.7 gflops
Length
145 mm
Memory bus width
64 Bit
128 Bit
Memory clock speed
1800 MHz
1782 MHz
Memory bandwidth
14.4 GB/s
28.51 GB/s
Shared memory
-
DirectX
12 (11_0)
12 (11_0)
Shader Model
5.1
5.1
OpenGL
4.5
4.6
OpenCL
1.2
1.2
Vulkan
1.1.126
1.1.126
CUDA
+
3.0
Bus support
PCI Express 3.0
Bitcoin / BTC (SHA256)
24 Mh/s
Optimus
+
GPU Boost
2.0
GameWorks
+
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