GeForce 940MX vs GeForce GT 645M
In this comparison between GeForce 940MX and GeForce GT 645M you will find out which graphics card performs better in today's games. Bear in mind that third-party versions may have more efficient cooling and higher clock speeds. This will increase cards' performance, though not by much. In addition to raw power you should also take into account the dimensions. Thicker models simply will not fit into a small mini-ITX case. The resolution of your monitor also affects the choice, since 4K gameplay requires a more powerful GPU. And don't overspend on the graphics card. Other parts of your build may also need to be upgraded, save some money for the CPU or power supply. For some people GeForce 940MX will be the best choice, for others GeForce GT 645M will be their preference. Study the comparison tables below and make your choice.
GeForce 940MX and GeForce GT 645M are Laptop Graphics Cards
Note: GeForce 940MX 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 940MX or GeForce GT 645M here:
Main Specs
GeForce 940MX
GeForce GT 645M
Power consumption (TDP)
23 Watt
32 Watt
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Supplementary power connectors
None
Memory type
DDR3, GDDR5
DDR3\GDDR5
Maximum RAM amount
4 GB
2 GB
Display Connectors
No outputs
No outputs
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GeForce GT 645M has 39% more power consumption, than GeForce 940MX.
GeForce 940MX is connected by PCIe 3.0 x8, and GeForce GT 645M uses PCIe 3.0 x16 interface.
GeForce 940MX has 2 GB more memory, than GeForce GT 645M.
Both cards are used in Laptops.
GeForce 940MX is build with Maxwell architecture, and GeForce GT 645M - with Kepler.
GeForce 940MX and GeForce GT 645M are manufactured by 28 nm process technology.
Memory clock speed of GeForce 940MX is 2200 MHz higher, than GeForce GT 645M.
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
7−8
1−2
ultra / 1080p
4−5
0−1
QHD / 1440p
0−1
0−1
low / 720p
16−18
12−14
medium / 1080p
8−9
2−3
The average gaming FPS of GeForce 940MX in Assassin's Creed Odyssey is 120% more, than GeForce GT 645M.
high / 1080p
12−14
−
ultra / 1080p
10−11
3−4
QHD / 1440p
0−1
0−1
low / 720p
24−27
12−14
medium / 1080p
12−14
4−5
The average gaming FPS of GeForce 940MX in Battlefield 5 is 128% more, than GeForce GT 645M.
low / 768p
45−50
50−55
high / 1080p
45−50
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 645M in Call of Duty: Warzone is 6% more, than GeForce 940MX.
low / 768p
140−150
110−120
medium / 768p
110−120
85−90
ultra / 1080p
55−60
35−40
QHD / 1440p
30−33
−
4K / 2160p
27−30
10−11
high / 768p
80−85
60−65
The average gaming FPS of GeForce 940MX in Counter-Strike: Global Offensive is 37% more, than GeForce GT 645M.
low / 768p
55−60
70−75
ultra / 1080p
20−22
14−16
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 645M in Cyberpunk 2077 is 7% more, than GeForce 940MX.
low / 768p
80−85
70−75
medium / 768p
60−65
45−50
ultra / 1080p
35−40
18−20
The average gaming FPS of GeForce 940MX in Dota 2 is 30% more, than GeForce GT 645M.
high / 1080p
8−9
2−3
ultra / 1080p
8−9
2−3
4K / 2160p
3−4
0−1
low / 720p
18−20
10−11
medium / 1080p
9−10
3−4
The average gaming FPS of GeForce 940MX in Far Cry 5 is 175% more, than GeForce GT 645M.
high / 1080p
14−16
−
ultra / 1080p
10−11
5−6
QHD / 1440p
−
1−2
low / 720p
60−65
45−50
medium / 1080p
24−27
8−9
The average gaming FPS of GeForce 940MX in Fortnite is 60% more, than GeForce GT 645M.
high / 1080p
12−14
3−4
ultra / 1080p
10−12
−
QHD / 1440p
1−2
0−1
low / 720p
27−30
14−16
medium / 1080p
14−16
6−7
The average gaming FPS of GeForce 940MX in Forza Horizon 4 is 125% more, than GeForce GT 645M.
low / 768p
50−55
40−45
medium / 768p
45−50
−
high / 1080p
12−14
3−4
ultra / 1080p
6−7
2−3
QHD / 1440p
0−1
0−1
medium / 720p
−
35−40
The average gaming FPS of GeForce 940MX in Grand Theft Auto V is 50% more, than GeForce GT 645M.
high / 1080p
5−6
1−2
ultra / 1080p
3−4
0−1
4K / 2160p
0−1
0−1
low / 720p
12−14
3−4
medium / 1080p
6−7
2−3
The average gaming FPS of GeForce 940MX in Metro Exodus is 300% more, than GeForce GT 645M.
low / 768p
95−100
85−90
high / 1080p
90−95
55−60
ultra / 1080p
80−85
−
medium / 1080p
90−95
−
The average gaming FPS of GeForce 940MX in Minecraft is 31% more, than GeForce GT 645M.
high / 1080p
16−18
14−16
ultra / 1080p
14−16
12−14
low / 720p
30−35
24−27
medium / 1080p
18−20
14−16
The average gaming FPS of GeForce 940MX in PLAYERUNKNOWN'S BATTLEGROUNDS is 17% more, than GeForce GT 645M.
ultra / 1080p
7−8
3−4
QHD / 1440p
0−1
0−1
low / 720p
12−14
4−5
medium / 1080p
10−12
−
The average gaming FPS of GeForce 940MX in Red Dead Redemption 2 is 150% more, than GeForce GT 645M.
low / 768p
24−27
8−9
medium / 768p
16−18
7−8
high / 1080p
9−10
3−4
ultra / 1080p
6−7
3−4
4K / 2160p
6−7
0−1
The average gaming FPS of GeForce 940MX in The Witcher 3: Wild Hunt is 180% more, than GeForce GT 645M.
low / 768p
85−90
70−75
medium / 768p
45−50
35−40
ultra / 1080p
20−22
12−14
high / 768p
35−40
30−33
The average gaming FPS of GeForce 940MX in World of Tanks is 26% more, than GeForce GT 645M.
Full Specs
GeForce 940MX
GeForce GT 645M
Architecture
Maxwell
Kepler
Code name
N16S-GTR-B/S
N13P-GS
Type
Laptop
Laptop
Release date
10 March 2016
22 March 2012
Pipelines
384
384
Core clock speed
1122 MHz
Boost Clock
1242 MHz
Transistor count
1,870 million
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
23.83
22.7 billion/sec
Floating-point performance
762.6 gflops
544.5 gflops
Memory bus width
64 Bit
128bit
Memory clock speed
4000 MHz
1800 MHz
Memory bandwidth
40.1 GB/s
Shared memory
-
-
DirectX
12 (11_0)
12 API
Shader Model
5.1
5.1
OpenGL
4.5
4.5
OpenCL
1.2
1.1
Vulkan
1.1
1.1.126
CUDA
+
+
CUDA cores
384
Bus support
PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
HDMI
+
HDCP
+
Maximum VGA resolution
Up to 2048x1536
3D Blu-Ray
+
Bitcoin / BTC (SHA256)
102 Mh/s
19 Mh/s
Laptop size
medium sized
medium sized
Optimus
+
+
GPU Boost
2.0
GameWorks
+
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