GeForce 840M vs GeForce GT 640M
Find out if it is worth upgrading your current GPU setup by comparing GeForce 840M and GeForce GT 640M. 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 840M and GeForce GT 640M. 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 840M and GeForce GT 640M are Laptop Graphics Cards
Note: GeForce 840M and GeForce GT 640M 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 840M or GeForce GT 640M here:
Main Specs
GeForce 840M
GeForce GT 640M
Power consumption (TDP)
33 Watt
32 Watt
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Memory type
DDR3
DDR3\GDDR5
Maximum RAM amount
4 GB
2 GB
Display Connectors
No outputs
No outputs
Check Price
Check Price
GeForce 840M has 3% more power consumption, than GeForce GT 640M.
GeForce 840M is connected by PCIe 3.0 x8, and GeForce GT 640M uses PCIe 3.0 x16 interface.
GeForce 840M has 2 GB more memory, than GeForce GT 640M.
Both cards are used in Laptops.
GeForce 840M is build with Maxwell architecture, and GeForce GT 640M - with Kepler.
GeForce 840M and GeForce GT 640M are manufactured by 28 nm process technology.
Memory clock speed of GeForce 840M is 200 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
1−2
0−1
ultra / 1080p
0−1
0−1
QHD / 1440p
0−1
0−1
low / 720p
12−14
10−12
medium / 1080p
3−4
2−3
The average gaming FPS of GeForce 840M in Assassin's Creed Odyssey is 33% more, than GeForce GT 640M.
ultra / 1080p
4−5
3−4
QHD / 1440p
0−1
0−1
low / 720p
16−18
12−14
medium / 1080p
5−6
4−5
The average gaming FPS of GeForce 840M in Battlefield 5 is 28% more, than GeForce GT 640M.
low / 768p
45−50
50−55
high / 1080p
40−45
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 640M in Call of Duty: Warzone is 11% more, than GeForce 840M.
low / 768p
120−130
110−120
medium / 768p
90−95
85−90
ultra / 1080p
40−45
35−40
QHD / 1440p
24−27
−
4K / 2160p
18−20
10−11
high / 768p
65−70
55−60
The average gaming FPS of GeForce 840M in Counter-Strike: Global Offensive is 13% more, than GeForce GT 640M.
low / 768p
85−90
70−75
ultra / 1080p
16−18
12−14
medium / 1080p
40−45
45−50
The average gaming FPS of GeForce 840M in Cyberpunk 2077 is 11% more, than GeForce GT 640M.
low / 768p
75−80
70−75
medium / 768p
50−55
40−45
ultra / 1080p
24−27
18−20
The average gaming FPS of GeForce 840M in Dota 2 is 15% more, than GeForce GT 640M.
high / 1080p
2−3
2−3
ultra / 1080p
2−3
2−3
4K / 2160p
0−1
0−1
low / 720p
12−14
9−10
medium / 1080p
3−4
3−4
The average gaming FPS of GeForce 840M in Far Cry 5 is 25% more, than GeForce GT 640M.
high / 1080p
10−11
−
ultra / 1080p
5−6
5−6
QHD / 1440p
2−3
1−2
low / 720p
50−55
45−50
medium / 1080p
10−12
7−8
The average gaming FPS of GeForce 840M in Fortnite is 13% more, than GeForce GT 640M.
high / 1080p
4−5
2−3
QHD / 1440p
0−1
0−1
low / 720p
16−18
14−16
medium / 1080p
7−8
5−6
The average gaming FPS of GeForce 840M in Forza Horizon 4 is 28% more, than GeForce GT 640M.
low / 768p
45−50
40−45
high / 1080p
5−6
3−4
ultra / 1080p
2−3
2−3
QHD / 1440p
0−1
0−1
medium / 720p
35−40
30−35
The average gaming FPS of GeForce 840M in Grand Theft Auto V is 15% more, than GeForce GT 640M.
high / 1080p
1−2
1−2
ultra / 1080p
0−1
0−1
4K / 2160p
0−1
0−1
low / 720p
5−6
2−3
medium / 1080p
3−4
2−3
The average gaming FPS of GeForce 840M in Metro Exodus is 50% more, than GeForce GT 640M.
low / 768p
90−95
85−90
high / 1080p
85−90
55−60
ultra / 1080p
70−75
−
medium / 1080p
90−95
−
The average gaming FPS of GeForce 840M in Minecraft is 25% more, than GeForce GT 640M.
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 840M in PLAYERUNKNOWN'S BATTLEGROUNDS is 5% more, than GeForce GT 640M.
ultra / 1080p
4−5
3−4
QHD / 1440p
0−1
0−1
low / 720p
6−7
3−4
The average gaming FPS of GeForce 840M in Red Dead Redemption 2 is 66% more, than GeForce GT 640M.
low / 768p
12−14
7−8
medium / 768p
9−10
6−7
high / 1080p
4−5
3−4
ultra / 1080p
3−4
−
4K / 2160p
0−1
0−1
The average gaming FPS of GeForce 840M in The Witcher 3: Wild Hunt is 80% more, than GeForce GT 640M.
low / 768p
75−80
70−75
medium / 768p
35−40
35−40
ultra / 1080p
16−18
12−14
high / 768p
30−35
27−30
The average gaming FPS of GeForce 840M in World of Tanks is 10% more, than GeForce GT 640M.
Full Specs
GeForce 840M
GeForce GT 640M
Architecture
Maxwell
Kepler
Code name
N15S-GT
N13P-GS
Type
Laptop
Laptop
Release date
12 March 2014
22 March 2012
Pipelines
384
384
Core clock speed
1029 MHz
Boost Clock
1124 MHz
645 MHz
Transistor count
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
17.98
Floating-point performance
863.2 gflops
480.0 gflops
Memory bus width
64 Bit
128bit
Memory clock speed
2000 MHz
1800 - 4000 MHz
Memory bandwidth
16.02 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
1.1.126
1.1.126
CUDA
+
+
CUDA cores
384
Bus support
PCI Express 2.0, 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)
92 Mh/s
18 Mh/s
Laptop size
medium sized
medium sized
Optimus
+
+
GPU Boost
2.0
GameWorks
+
Check Price
Check Price
