Radeon HD 7950 and GeForce GTX 660 Rev. 2 - video card comparison
Radeon HD 7950
GeForce GTX 660 Rev. 2
Architecture
GCN 1.0 (2012−2020)
Kepler (2012−2018)
GPU code name
Tahiti
GK104
Market segment
Desktop
Desktop
Release date
January 2012
September 2014
Bus support
PCIe 3.0 x16
-
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 6-pin
1x 6-pin
Boost clock speed
1250 MHz
1032 MHz
Compute units
28
-
Core clock speed
-
980 MHz
Floating-point performance
2,867 gflops
1,981 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
4,313 million
3,540 million
Pipelines / CUDA cores
1792
960
Power consumption (TDP)
200 Watt
140 Watt
Texture fill rate
89.60
82.56
Memory type
GDDR5
GDDR5
Maximum RAM amount
3 GB
2 GB
Memory bus width
384 Bit
192 Bit
Memory clock speed
1250 MHz
6008 MHz
Memory bandwidth
240 GB/s
144.2 GB/s
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
2x DVI, 1x HDMI, 1x DisplayPort
Eyefinity
1
-
Number of Eyefinity displays
6
-
HDMI
+
+
DisplayPort support
-
-
DirectX
DirectX® 11
12 (11_0)
CUDA
-
3.0
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
-
1.1.126
AppAcceleration
+
-
CrossFire
1
-
Enduro
-
-
FreeSync
1
-
HD3D
-
-
PowerTune
+
-
TrueAudio
-
-
ZeroCore
+
-