GeForce 840M vs GeForce GTX 660M
In this comparison between GeForce 840M and GeForce GTX 660M 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 840M will be the best choice, for others GeForce GTX 660M will be their preference. Study the comparison tables below and make your choice.
GeForce 840M and GeForce GTX 660M are Laptop Graphics Cards
Note: GeForce 840M and GeForce GTX 660M 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 GTX 660M here:
Main Specs
GeForce 840M
GeForce GTX 660M
Power consumption (TDP)
33 Watt
50 Watt
Interface
PCIe 3.0 x8
MXM-B (3.0)
Memory type
DDR3
GDDR5
Maximum RAM amount
4 GB
2 GB
Display Connectors
No outputs
No outputs
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GeForce GTX 660M has 51% more power consumption, than GeForce 840M.
GeForce 840M is connected by PCIe 3.0 x8, and GeForce GTX 660M uses MXM-B (3.0) interface.
GeForce 840M has 2 GB more memory, than GeForce GTX 660M.
Both cards are used in Laptops.
GeForce 840M is build with Maxwell architecture, and GeForce GTX 660M - with Kepler.
Core clock speed of GeForce 840M is 194 MHz higher, than GeForce GTX 660M.
GeForce 840M and GeForce GTX 660M are manufactured by 28 nm process technology.
Memory clock speed of GeForce 840M and GeForce GTX 660M is 2000 MHz.
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
6−7
ultra / 1080p
0−1
4−5
QHD / 1440p
0−1
0−1
low / 720p
12−14
16−18
medium / 1080p
3−4
8−9
The average gaming FPS of GeForce GTX 660M in Assassin's Creed Odyssey is 66% more, than GeForce 840M.
high / 1080p
−
12−14
ultra / 1080p
4−5
10−11
QHD / 1440p
0−1
0−1
low / 720p
16−18
24−27
medium / 1080p
5−6
12−14
The average gaming FPS of GeForce GTX 660M in Battlefield 5 is 77% more, than GeForce 840M.
low / 768p
45−50
45−50
high / 1080p
40−45
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 840M.
low / 768p
120−130
130−140
medium / 768p
90−95
110−120
ultra / 1080p
40−45
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 17% more, than GeForce 840M.
low / 768p
85−90
55−60
ultra / 1080p
16−18
18−20
medium / 1080p
40−45
45−50
The average gaming FPS of GeForce 840M in Cyberpunk 2077 is 19% more, than GeForce GTX 660M.
low / 768p
75−80
80−85
medium / 768p
50−55
55−60
ultra / 1080p
24−27
30−35
The average gaming FPS of GeForce GTX 660M in Dota 2 is 11% more, than GeForce 840M.
high / 1080p
2−3
8−9
ultra / 1080p
2−3
7−8
4K / 2160p
0−1
3−4
low / 720p
12−14
18−20
medium / 1080p
3−4
8−9
The average gaming FPS of GeForce GTX 660M in Far Cry 5 is 100% more, than GeForce 840M.
high / 1080p
10−11
14−16
ultra / 1080p
5−6
10−11
QHD / 1440p
2−3
−
low / 720p
50−55
60−65
medium / 1080p
10−12
21−24
The average gaming FPS of GeForce GTX 660M in Fortnite is 42% more, than GeForce 840M.
high / 1080p
4−5
12−14
ultra / 1080p
−
10−12
QHD / 1440p
0−1
1−2
low / 720p
16−18
24−27
medium / 1080p
7−8
14−16
The average gaming FPS of GeForce GTX 660M in Forza Horizon 4 is 88% more, than GeForce 840M.
low / 768p
45−50
50−55
medium / 768p
−
45−50
high / 1080p
5−6
12−14
ultra / 1080p
2−3
6−7
QHD / 1440p
0−1
0−1
medium / 720p
35−40
−
The average gaming FPS of GeForce GTX 660M in Grand Theft Auto V is 33% more, than GeForce 840M.
high / 1080p
1−2
4−5
ultra / 1080p
0−1
3−4
4K / 2160p
0−1
0−1
low / 720p
5−6
12−14
medium / 1080p
3−4
6−7
The average gaming FPS of GeForce GTX 660M in Metro Exodus is 166% more, than GeForce 840M.
low / 768p
90−95
95−100
high / 1080p
85−90
90−95
ultra / 1080p
70−75
80−85
medium / 1080p
90−95
90−95
The average gaming FPS of GeForce GTX 660M in Minecraft is 5% more, than GeForce 840M.
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 840M.
ultra / 1080p
4−5
7−8
QHD / 1440p
0−1
0−1
low / 720p
6−7
12−14
medium / 1080p
−
10−12
The average gaming FPS of GeForce GTX 660M in Red Dead Redemption 2 is 100% more, than GeForce 840M.
low / 768p
12−14
24−27
medium / 768p
9−10
16−18
high / 1080p
4−5
9−10
ultra / 1080p
3−4
6−7
4K / 2160p
0−1
6−7
The average gaming FPS of GeForce GTX 660M in The Witcher 3: Wild Hunt is 100% more, than GeForce 840M.
low / 768p
75−80
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 14% more, than GeForce 840M.
Full Specs
GeForce 840M
GeForce GTX 660M
Architecture
Maxwell
Kepler
Code name
N15S-GT
N13E-GE
Type
Laptop
Laptop
Release date
12 March 2014
22 March 2012
Pipelines
384
384
Core clock speed
1029 MHz
835 MHz
Boost Clock
1124 MHz
950 MHz
Transistor count
1,270 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
17.98
30.4 billion/sec
Floating-point performance
863.2 gflops
729.6 gflops
Memory bus width
64 Bit
128bit
Memory clock speed
2000 MHz
2000 MHz
Memory bandwidth
16.02 GB/s
64.0 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
SLI options
+
HDMI
+
HDCP
+
Maximum VGA resolution
Up to 2048x1536
Bitcoin / BTC (SHA256)
92 Mh/s
36 Mh/s
Laptop size
medium sized
large
Optimus
+
+
GPU Boost
2.0
GameWorks
+
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