Radeon HD 6930 and GeForce GTX 660 Rev. 2 - video card comparison
Radeon HD 6930
GeForce GTX 660 Rev. 2
Architecture
TeraScale 3 (2010−2013)
Kepler (2012−2018)
GPU code name
Cayman
GK104
Market segment
Desktop
Desktop
Release date
December 2011
September 2014
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 6-pin
1x 6-pin
Boost clock speed
-
1032 MHz
Core clock speed
750 MHz
980 MHz
Floating-point performance
1,920.0 gflops
1,981 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
2,640 million
3,540 million
Pipelines / CUDA cores
1280
960
Power consumption (TDP)
186 Watt
140 Watt
Texture fill rate
60.00
82.56
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
2 GB
Memory bus width
256 Bit
192 Bit
Memory clock speed
4800 MHz
6008 MHz
Memory bandwidth
153.6 GB/s
144.2 GB/s
Display Connectors
2x DVI, 1x HDMI, 2x mini-DisplayPort
2x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
DirectX
11.2 (11_0)
12 (11_0)
CUDA
-
3.0
OpenCL
1.2
1.2
OpenGL
4.4
4.6
Shader Model
5.0
5.1
Vulkan
N/A
1.1.126