GeForce GTX 660 vs Radeon HD 6990
When choosing between GeForce GTX 660 and Radeon HD 6990, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between GeForce GTX 660 and Radeon HD 6990.
Main Specs
GeForce GTX 660
Radeon HD 6990
Power consumption (TDP)
140 Watt
375 Watt
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
One 6-pin
2x 8-pin
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 4x mini-DisplayPort
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Radeon HD 6990 has 167% more power consumption, than GeForce GTX 660.
GeForce GTX 660 is connected by PCIe 3.0 x16, and Radeon HD 6990 uses PCIe 2.0 x16 interface.
GeForce GTX 660 and Radeon HD 6990 have maximum RAM of 2 GB.
Both cards are used in Desktops.
GeForce GTX 660 is build with Kepler architecture, and Radeon HD 6990 - with TeraScale 3.
Core clock speed of GeForce GTX 660 is 150 MHz higher, than Radeon HD 6990.
GeForce GTX 660 is manufactured by 28 nm process technology, and Radeon HD 6990 - by 40 nm process technology.
Radeon HD 6990 is 286 mm longer, than GeForce GTX 660.
Memory clock speed of Radeon HD 6990 is 4994 MHz higher, than GeForce GTX 660.
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
20−22
14−16
ultra / 1080p
12−14
9−10
QHD / 1440p
6−7
3−4
4K / 2160p
5−6
−
low / 720p
40−45
30−35
medium / 1080p
24−27
18−20
The average gaming FPS of GeForce GTX 660 in Assassin's Creed Odyssey is 40% more, than Radeon HD 6990.
high / 1080p
30−35
24−27
ultra / 1080p
27−30
21−24
QHD / 1440p
10−12
7−8
4K / 2160p
8−9
5−6
low / 720p
65−70
50−55
medium / 1080p
35−40
27−30
The average gaming FPS of GeForce GTX 660 in Battlefield 5 is 30% more, than Radeon HD 6990.
low / 768p
50−55
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GTX 660 in Call of Duty: Warzone is 10% more, than Radeon HD 6990.
low / 768p
230−240
210−220
medium / 768p
200−210
170−180
ultra / 1080p
120−130
95−100
QHD / 1440p
90−95
50−55
4K / 2160p
50−55
30−33
high / 768p
160−170
140−150
The average gaming FPS of GeForce GTX 660 in Counter-Strike: Global Offensive is 21% more, than Radeon HD 6990.
low / 768p
60−65
55−60
ultra / 1080p
50−55
40−45
medium / 1080p
55−60
45−50
The average gaming FPS of GeForce GTX 660 in Cyberpunk 2077 is 16% more, than Radeon HD 6990.
low / 768p
120−130
110−120
medium / 768p
100−110
90−95
ultra / 1080p
80−85
60−65
The average gaming FPS of GeForce GTX 660 in Dota 2 is 15% more, than Radeon HD 6990.
high / 1080p
24−27
18−20
ultra / 1080p
21−24
16−18
QHD / 1440p
18−20
−
4K / 2160p
8−9
6−7
low / 720p
50−55
35−40
medium / 1080p
27−30
18−20
The average gaming FPS of GeForce GTX 660 in Far Cry 5 is 42% more, than Radeon HD 6990.
high / 1080p
30−35
24−27
ultra / 1080p
24−27
18−20
QHD / 1440p
16−18
16−18
low / 720p
120−130
95−100
medium / 1080p
70−75
50−55
The average gaming FPS of GeForce GTX 660 in Fortnite is 28% more, than Radeon HD 6990.
high / 1080p
30−35
24−27
ultra / 1080p
24−27
20−22
QHD / 1440p
14−16
9−10
4K / 2160p
12−14
−
low / 720p
65−70
50−55
medium / 1080p
35−40
27−30
The average gaming FPS of GeForce GTX 660 in Forza Horizon 4 is 29% more, than Radeon HD 6990.
low / 768p
100−110
85−90
medium / 768p
90−95
75−80
high / 1080p
40−45
30−33
ultra / 1080p
16−18
12−14
QHD / 1440p
7−8
3−4
The average gaming FPS of GeForce GTX 660 in Grand Theft Auto V is 23% more, than Radeon HD 6990.
high / 1080p
12−14
9−10
ultra / 1080p
10−11
7−8
QHD / 1440p
10−11
−
4K / 2160p
3−4
2−3
low / 720p
40−45
27−30
medium / 1080p
18−20
12−14
The average gaming FPS of GeForce GTX 660 in Metro Exodus is 41% more, than Radeon HD 6990.
low / 768p
120−130
110−120
ultra / 1080p
−
100−110
medium / 1080p
110−120
100−110
The average gaming FPS of GeForce GTX 660 in Minecraft is 9% more, than Radeon HD 6990.
high / 1080p
−
21−24
ultra / 1080p
14−16
18−20
low / 720p
70−75
55−60
medium / 1080p
18−20
24−27
The average gaming FPS of GeForce GTX 660 in PLAYERUNKNOWN'S BATTLEGROUNDS is 2% more, than Radeon HD 6990.
high / 1080p
14−16
14−16
ultra / 1080p
10−11
9−10
QHD / 1440p
1−2
0−1
4K / 2160p
1−2
−
low / 720p
35−40
27−30
medium / 1080p
21−24
16−18
The average gaming FPS of GeForce GTX 660 in Red Dead Redemption 2 is 23% more, than Radeon HD 6990.
low / 768p
70−75
55−60
medium / 768p
45−50
30−35
high / 1080p
24−27
18−20
ultra / 1080p
14−16
10−12
4K / 2160p
8−9
8−9
The average gaming FPS of GeForce GTX 660 in The Witcher 3: Wild Hunt is 32% more, than Radeon HD 6990.
low / 768p
90−95
100−110
medium / 768p
60−65
60−65
ultra / 1080p
40−45
35−40
high / 768p
55−60
50−55
The average gaming FPS of Radeon HD 6990 in World of Tanks is 1% more, than GeForce GTX 660.
Full Specs
GeForce GTX 660
Radeon HD 6990
Architecture
Kepler
TeraScale 3
Code name
GK106
Antilles
Type
Desktop
Desktop
Release date
6 September 2012
8 March 2011
Pipelines
960
1536
Core clock speed
980 MHz
830 MHz
Boost Clock
1033 MHz
Transistor count
2,540 million
2,640 million
Manufacturing process technology
28 nm
40 nm
Texture fill rate
78.4 billion/sec
79.68
Floating-point performance
1,981 gflops
2x 2,549.8 gflops
Length
9.5" (24.1 cm)
295 mm
Memory bus width
192-bit GDDR5
256 Bit
Memory clock speed
6.0 GB/s
5000 MHz
Memory bandwidth
144.2 GB/s
160.0 GB/s
DirectX
12 (11_0)
11.2 (11_0)
Shader Model
5.1
5.0
OpenGL
4.3
4.4
OpenCL
1.2
1.2
Vulkan
1.1.126
N/A
CUDA
+
CUDA cores
960
Bus support
PCI Express 3.0
Height
4.376" (11.1 cm)
SLI options
+
Multi monitor support
4 displays
HDMI
+
HDCP
+
Maximum VGA resolution
2048x1536
Audio input for HDMI
Internal
3D Blu-Ray
+
3D Gaming
+
3D Vision
+
Bitcoin / BTC (SHA256)
66 Mh/s
265 Mh/s
Ethereum / ETH (DaggerHashimoto)
24 Mh/s
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