GeForce 840A vs GeForce GT 640
In this comparison between GeForce 840A and GeForce GT 640 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 840A will be the best choice, for others GeForce GT 640 will be their preference. Study the comparison tables below and make your choice.
GeForce 840A
Main Specs
GeForce 840A
GeForce GT 640
Power consumption (TDP)
33 Watt
65 Watt
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Supplementary power connectors
None
Memory type
DDR3
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 96% more power consumption, than GeForce 840A.
GeForce 840A is connected by PCIe 3.0 x8, and GeForce GT 640 uses PCIe 3.0 x16 interface.
GeForce 840A and GeForce GT 640 have maximum RAM of 2 GB.
Both cards are used in Desktops.
GeForce 840A is build with Maxwell architecture, and GeForce GT 640 - with Kepler.
Core clock speed of GeForce 840A is 127 MHz higher, than GeForce GT 640.
GeForce 840A and GeForce GT 640 are manufactured by 28 nm process technology.
Memory clock speed of GeForce 840A is 220 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
3−4
2−3
ultra / 1080p
2−3
1−2
QHD / 1440p
0−1
0−1
low / 720p
14−16
14−16
medium / 1080p
5−6
5−6
GeForce 840A and GeForce GT 640 have the same average FPS in Assassin's Creed Odyssey.
high / 1080p
−
7−8
ultra / 1080p
7−8
5−6
QHD / 1440p
0−1
0−1
low / 720p
18−20
20−22
medium / 1080p
8−9
7−8
GeForce 840A and GeForce GT 640 have the same average FPS in Battlefield 5.
low / 768p
45−50
50−55
high / 1080p
30−35
35−40
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 640 in Call of Duty: Warzone is 12% more, than GeForce 840A.
low / 768p
120−130
110−120
medium / 768p
90−95
90−95
ultra / 1080p
40−45
45−50
QHD / 1440p
24−27
24−27
4K / 2160p
18−20
18−20
high / 768p
65−70
65−70
The average gaming FPS of GeForce 840A in Counter-Strike: Global Offensive is 1% more, than GeForce GT 640.
low / 768p
80−85
70−75
ultra / 1080p
14−16
21−24
medium / 1080p
40−45
45−50
The average gaming FPS of GeForce GT 640 in Cyberpunk 2077 is 2% more, than GeForce 840A.
low / 768p
75−80
70−75
medium / 768p
50−55
50−55
ultra / 1080p
27−30
27−30
The average gaming FPS of GeForce 840A in Dota 2 is 1% more, than GeForce GT 640.
high / 1080p
5−6
3−4
ultra / 1080p
−
3−4
4K / 2160p
2−3
2−3
low / 720p
14−16
14−16
medium / 1080p
6−7
4−5
The average gaming FPS of GeForce 840A in Far Cry 5 is 16% more, than GeForce GT 640.
high / 1080p
12−14
10−12
ultra / 1080p
7−8
5−6
QHD / 1440p
−
2−3
low / 720p
50−55
50−55
medium / 1080p
14−16
16−18
The average gaming FPS of GeForce 840A in Fortnite is 4% more, than GeForce GT 640.
high / 1080p
7−8
6−7
QHD / 1440p
0−1
4−5
4K / 2160p
−
2−3
low / 720p
20−22
21−24
medium / 1080p
9−10
9−10
GeForce 840A and GeForce GT 640 have the same average FPS in Forza Horizon 4.
low / 768p
45−50
45−50
high / 1080p
8−9
7−8
ultra / 1080p
5−6
3−4
QHD / 1440p
0−1
0−1
medium / 720p
40−45
40−45
The average gaming FPS of GeForce 840A in Grand Theft Auto V is 4% more, than GeForce GT 640.
high / 1080p
3−4
2−3
ultra / 1080p
1−2
0−1
4K / 2160p
0−1
0−1
low / 720p
8−9
8−9
medium / 1080p
4−5
4−5
GeForce 840A and GeForce GT 640 have the same average FPS in Metro Exodus.
low / 768p
85−90
80−85
high / 1080p
85−90
−
ultra / 1080p
80−85
70−75
medium / 1080p
85−90
−
The average gaming FPS of GeForce 840A in Minecraft is 10% more, than GeForce GT 640.
ultra / 1080p
12−14
12−14
low / 720p
27−30
27−30
medium / 1080p
14−16
14−16
GeForce 840A and GeForce GT 640 have the same average FPS in PLAYERUNKNOWN'S BATTLEGROUNDS.
high / 1080p
−
6−7
ultra / 1080p
7−8
4−5
QHD / 1440p
0−1
0−1
low / 720p
8−9
7−8
The average gaming FPS of GeForce 840A in Red Dead Redemption 2 is 33% more, than GeForce GT 640.
low / 768p
16−18
14−16
medium / 768p
12−14
10−11
high / 1080p
6−7
5−6
ultra / 1080p
5−6
4−5
4K / 2160p
−
0−1
The average gaming FPS of GeForce 840A in The Witcher 3: Wild Hunt is 25% more, than GeForce GT 640.
low / 768p
70−75
70−75
medium / 768p
35−40
35−40
ultra / 1080p
16−18
16−18
high / 768p
30−35
30−35
GeForce 840A and GeForce GT 640 have the same average FPS in World of Tanks.
Full Specs
GeForce 840A
GeForce GT 640
Architecture
Maxwell
Kepler
Code name
GM108
GK107
Type
Desktop
Desktop
Release date
17 March 2014
5 June 2012
Pipelines
384
384
Core clock speed
1029 MHz
902 MHz
Boost Clock
1124 MHz
Transistor count
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
17.98
28.86
Floating-point performance
863.2 gflops
692.7 gflops
Length
145 mm
Memory bus width
64 Bit
128 Bit
Memory clock speed
2002 MHz
1782 MHz
Memory bandwidth
16.02 GB/s
28.51 GB/s
DirectX
12 (11_0)
12 (11_0)
Shader Model
5.1
5.1
OpenGL
4.6
4.6
OpenCL
1.2
1.2
Vulkan
1.1.126
1.1.126
CUDA
5.0
3.0
Bitcoin / BTC (SHA256)
24 Mh/s
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