GeForce GTX 660 vs Radeon HD 7990
If you are going to buy a new graphics card and are choosing between GeForce GTX 660 and Radeon HD 7990, 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 660 stacks up against Radeon HD 7990, check out specs charts below.
Main Specs
GeForce GTX 660
Radeon HD 7990
Power consumption (TDP)
140 Watt
375 Watt
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
One 6-pin
2x 8-pin
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
3 GB
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 4x mini-DisplayPort
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Radeon HD 7990 has 167% more power consumption, than GeForce GTX 660.
Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
Radeon HD 7990 has 1 GB more memory, than GeForce GTX 660.
Both cards are used in Desktops.
GeForce GTX 660 is build with Kepler architecture, and Radeon HD 7990 - with GCN 1.0.
Core clock speed of GeForce GTX 660 is 30 MHz higher, than Radeon HD 7990.
GeForce GTX 660 and Radeon HD 7990 are manufactured by 28 nm process technology.
Radeon HD 7990 is 298 mm longer, than GeForce GTX 660.
Memory clock speed of Radeon HD 7990 is 5994 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
35−40
ultra / 1080p
12−14
21−24
QHD / 1440p
6−7
16−18
4K / 2160p
5−6
10−11
low / 720p
40−45
60−65
medium / 1080p
24−27
40−45
The average gaming FPS of Radeon HD 7990 in Assassin's Creed Odyssey is 68% more, than GeForce GTX 660.
high / 1080p
30−35
55−60
ultra / 1080p
27−30
45−50
QHD / 1440p
10−12
35−40
4K / 2160p
8−9
18−20
low / 720p
65−70
100−110
medium / 1080p
35−40
60−65
The average gaming FPS of Radeon HD 7990 in Battlefield 5 is 80% more, than GeForce GTX 660.
low / 768p
50−55
50−55
QHD / 1440p
0−1
0−1
GeForce GTX 660 and Radeon HD 7990 have the same average FPS in Call of Duty: Warzone.
low / 768p
230−240
250−260
medium / 768p
200−210
220−230
ultra / 1080p
120−130
180−190
QHD / 1440p
90−95
110−120
4K / 2160p
50−55
70−75
high / 768p
160−170
210−220
The average gaming FPS of Radeon HD 7990 in Counter-Strike: Global Offensive is 22% more, than GeForce GTX 660.
low / 768p
60−65
60−65
ultra / 1080p
50−55
−
medium / 1080p
55−60
55−60
GeForce GTX 660 and Radeon HD 7990 have the same average FPS in Cyberpunk 2077.
low / 768p
120−130
120−130
medium / 768p
100−110
110−120
ultra / 1080p
80−85
100−110
The average gaming FPS of Radeon HD 7990 in Dota 2 is 10% more, than GeForce GTX 660.
high / 1080p
24−27
45−50
ultra / 1080p
21−24
40−45
QHD / 1440p
18−20
27−30
4K / 2160p
8−9
14−16
low / 720p
50−55
80−85
medium / 1080p
27−30
45−50
The average gaming FPS of Radeon HD 7990 in Far Cry 5 is 65% more, than GeForce GTX 660.
high / 1080p
30−35
60−65
ultra / 1080p
24−27
45−50
QHD / 1440p
16−18
27−30
4K / 2160p
−
27−30
low / 720p
120−130
180−190
medium / 1080p
70−75
110−120
The average gaming FPS of Radeon HD 7990 in Fortnite is 61% more, than GeForce GTX 660.
high / 1080p
30−35
60−65
ultra / 1080p
24−27
45−50
QHD / 1440p
14−16
30−35
4K / 2160p
12−14
24−27
low / 720p
65−70
100−110
medium / 1080p
35−40
65−70
The average gaming FPS of Radeon HD 7990 in Forza Horizon 4 is 80% more, than GeForce GTX 660.
low / 768p
100−110
140−150
medium / 768p
90−95
120−130
high / 1080p
40−45
70−75
ultra / 1080p
16−18
30−35
QHD / 1440p
7−8
21−24
The average gaming FPS of Radeon HD 7990 in Grand Theft Auto V is 51% more, than GeForce GTX 660.
high / 1080p
12−14
24−27
ultra / 1080p
10−11
20−22
QHD / 1440p
10−11
16−18
4K / 2160p
3−4
8−9
low / 720p
40−45
65−70
medium / 1080p
18−20
30−35
The average gaming FPS of Radeon HD 7990 in Metro Exodus is 75% more, than GeForce GTX 660.
low / 768p
120−130
130−140
medium / 1080p
110−120
120−130
The average gaming FPS of Radeon HD 7990 in Minecraft is 8% more, than GeForce GTX 660.
ultra / 1080p
14−16
14−16
low / 720p
70−75
100−110
medium / 1080p
18−20
18−20
The average gaming FPS of Radeon HD 7990 in PLAYERUNKNOWN'S BATTLEGROUNDS is 31% more, than GeForce GTX 660.
high / 1080p
14−16
24−27
ultra / 1080p
10−11
16−18
QHD / 1440p
1−2
10−11
4K / 2160p
1−2
7−8
low / 720p
35−40
65−70
medium / 1080p
21−24
35−40
The average gaming FPS of Radeon HD 7990 in Red Dead Redemption 2 is 92% more, than GeForce GTX 660.
low / 768p
70−75
130−140
medium / 768p
45−50
85−90
high / 1080p
24−27
45−50
ultra / 1080p
14−16
24−27
4K / 2160p
8−9
16−18
The average gaming FPS of Radeon HD 7990 in The Witcher 3: Wild Hunt is 87% more, than GeForce GTX 660.
low / 768p
90−95
90−95
medium / 768p
60−65
60−65
ultra / 1080p
40−45
50−55
high / 768p
55−60
60−65
The average gaming FPS of Radeon HD 7990 in World of Tanks is 6% more, than GeForce GTX 660.
Full Specs
GeForce GTX 660
Radeon HD 7990
Architecture
Kepler
GCN 1.0
Code name
GK106
Malta
Type
Desktop
Desktop
Release date
6 September 2012
24 April 2013
Pipelines
960
2048
Core clock speed
980 MHz
950 MHz
Boost Clock
1033 MHz
1000 MHz
Transistor count
2,540 million
4,313 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
78.4 billion/sec
128.0
Floating-point performance
1,981 gflops
2x 4,096 gflops
Length
9.5" (24.1 cm)
307 mm
Memory bus width
192-bit GDDR5
384 Bit
Memory clock speed
6.0 GB/s
6000 MHz
Memory bandwidth
144.2 GB/s
288.0 GB/s
DirectX
12 (11_0)
12 (11_1)
Shader Model
5.1
5.1
OpenGL
4.3
4.6
OpenCL
1.2
1.2
Vulkan
1.1.126
1.2.131
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
459 Mh/s
Ethereum / ETH (DaggerHashimoto)
44 Mh/s
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