GeForce GTX 660M vs Radeon HD 6990
If you are going to buy a new graphics card and are choosing between GeForce GTX 660M and Radeon HD 6990, 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 GTX 660M stacks up against Radeon HD 6990, check out specs charts below.
GeForce GTX 660M is a Laptop Graphics Card
Note: GeForce GTX 660M 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 GTX 660M here:
Main Specs
GeForce GTX 660M
Radeon HD 6990
Power consumption (TDP)
50 Watt
375 Watt
Interface
MXM-B (3.0)
PCIe 2.0 x16
Supplementary power connectors
2x 8-pin
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Display Connectors
No outputs
1x DVI, 4x mini-DisplayPort
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Radeon HD 6990 has 650% more power consumption, than GeForce GTX 660M.
GeForce GTX 660M is connected by MXM-B (3.0), and Radeon HD 6990 uses PCIe 2.0 x16 interface.
GeForce GTX 660M and Radeon HD 6990 have maximum RAM of 2 GB.
GeForce GTX 660M is used in Laptops, and Radeon HD 6990 - in Desktops.
GeForce GTX 660M is build with Kepler architecture, and Radeon HD 6990 - with TeraScale 3.
Core clock speed of GeForce GTX 660M is 5 MHz higher, than Radeon HD 6990.
GeForce GTX 660M is manufactured by 28 nm process technology, and Radeon HD 6990 - by 40 nm process technology.
Memory clock speed of Radeon HD 6990 is 3000 MHz higher, than GeForce GTX 660M.
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
6−7
14−16
ultra / 1080p
4−5
9−10
QHD / 1440p
0−1
3−4
low / 720p
16−18
30−35
medium / 1080p
8−9
18−20
The average gaming FPS of Radeon HD 6990 in Assassin's Creed Odyssey is 111% more, than GeForce GTX 660M.
high / 1080p
12−14
24−27
ultra / 1080p
10−11
21−24
QHD / 1440p
0−1
7−8
4K / 2160p
−
5−6
low / 720p
24−27
50−55
medium / 1080p
12−14
27−30
The average gaming FPS of Radeon HD 6990 in Battlefield 5 is 113% more, than GeForce GTX 660M.
low / 768p
45−50
45−50
high / 1080p
45−50
−
QHD / 1440p
0−1
0−1
GeForce GTX 660M and Radeon HD 6990 have the same average FPS in Call of Duty: Warzone.
low / 768p
130−140
210−220
medium / 768p
110−120
170−180
ultra / 1080p
50−55
95−100
QHD / 1440p
27−30
50−55
4K / 2160p
27−30
30−33
high / 768p
80−85
140−150
The average gaming FPS of Radeon HD 6990 in Counter-Strike: Global Offensive is 63% more, than GeForce GTX 660M.
low / 768p
55−60
55−60
ultra / 1080p
18−20
40−45
medium / 1080p
45−50
45−50
The average gaming FPS of Radeon HD 6990 in Cyberpunk 2077 is 19% more, than GeForce GTX 660M.
low / 768p
80−85
110−120
medium / 768p
55−60
90−95
ultra / 1080p
30−35
60−65
The average gaming FPS of Radeon HD 6990 in Dota 2 is 57% more, than GeForce GTX 660M.
high / 1080p
8−9
18−20
ultra / 1080p
7−8
16−18
4K / 2160p
3−4
6−7
low / 720p
18−20
35−40
medium / 1080p
8−9
18−20
The average gaming FPS of Radeon HD 6990 in Far Cry 5 is 111% more, than GeForce GTX 660M.
high / 1080p
14−16
24−27
ultra / 1080p
10−11
18−20
QHD / 1440p
−
16−18
low / 720p
60−65
95−100
medium / 1080p
21−24
50−55
The average gaming FPS of Radeon HD 6990 in Fortnite is 77% more, than GeForce GTX 660M.
high / 1080p
12−14
24−27
ultra / 1080p
10−12
20−22
QHD / 1440p
1−2
9−10
low / 720p
24−27
50−55
medium / 1080p
14−16
27−30
The average gaming FPS of Radeon HD 6990 in Forza Horizon 4 is 107% more, than GeForce GTX 660M.
low / 768p
50−55
85−90
medium / 768p
45−50
75−80
high / 1080p
12−14
30−33
ultra / 1080p
6−7
12−14
QHD / 1440p
0−1
3−4
The average gaming FPS of Radeon HD 6990 in Grand Theft Auto V is 79% more, than GeForce GTX 660M.
high / 1080p
4−5
9−10
ultra / 1080p
3−4
7−8
4K / 2160p
0−1
2−3
low / 720p
12−14
27−30
medium / 1080p
6−7
12−14
The average gaming FPS of Radeon HD 6990 in Metro Exodus is 133% more, than GeForce GTX 660M.
low / 768p
95−100
110−120
high / 1080p
90−95
−
ultra / 1080p
80−85
100−110
medium / 1080p
90−95
100−110
The average gaming FPS of Radeon HD 6990 in Minecraft is 20% more, than GeForce GTX 660M.
high / 1080p
16−18
21−24
ultra / 1080p
14−16
18−20
low / 720p
30−35
55−60
medium / 1080p
18−20
24−27
The average gaming FPS of Radeon HD 6990 in PLAYERUNKNOWN'S BATTLEGROUNDS is 55% more, than GeForce GTX 660M.
high / 1080p
−
14−16
ultra / 1080p
7−8
9−10
QHD / 1440p
0−1
0−1
low / 720p
12−14
27−30
medium / 1080p
10−12
16−18
The average gaming FPS of Radeon HD 6990 in Red Dead Redemption 2 is 80% more, than GeForce GTX 660M.
low / 768p
24−27
55−60
medium / 768p
16−18
30−35
high / 1080p
9−10
18−20
ultra / 1080p
6−7
10−12
4K / 2160p
6−7
8−9
The average gaming FPS of Radeon HD 6990 in The Witcher 3: Wild Hunt is 92% more, than GeForce GTX 660M.
low / 768p
85−90
100−110
medium / 768p
45−50
60−65
ultra / 1080p
18−20
35−40
high / 768p
35−40
50−55
The average gaming FPS of Radeon HD 6990 in World of Tanks is 36% more, than GeForce GTX 660M.
Full Specs
GeForce GTX 660M
Radeon HD 6990
Architecture
Kepler
TeraScale 3
Code name
N13E-GE
Antilles
Type
Laptop
Desktop
Release date
22 March 2012
8 March 2011
Pipelines
384
1536
Core clock speed
835 MHz
830 MHz
Boost Clock
950 MHz
Transistor count
1,270 million
2,640 million
Manufacturing process technology
28 nm
40 nm
Texture fill rate
30.4 billion/sec
79.68
Floating-point performance
729.6 gflops
2x 2,549.8 gflops
Length
295 mm
Memory bus width
128bit
256 Bit
Memory clock speed
2000 MHz
5000 MHz
Memory bandwidth
64.0 GB/s
160.0 GB/s
Shared memory
-
DirectX
12 API
11.2 (11_0)
Shader Model
5.1
5.0
OpenGL
4.5
4.4
OpenCL
1.1
1.2
Vulkan
1.1.126
N/A
CUDA
+
CUDA cores
384
Bus support
PCI Express 2.0, PCI Express 3.0
SLI options
+
HDMI
+
HDCP
+
Maximum VGA resolution
Up to 2048x1536
Bitcoin / BTC (SHA256)
36 Mh/s
265 Mh/s
Laptop size
large
Optimus
+
Ethereum / ETH (DaggerHashimoto)
24 Mh/s
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