GeForce GTX 660 and Radeon HD 6790 - video card comparison
Passmark - benchmark score GeForce GTX 660 vs Radeon HD 6790
GeForce GTX 660
4119
Radeon HD 6790
1664
GeForce GTX 660
Radeon HD 6790
Architecture
Kepler (2012−2018)
Terascale 2 (2009−2015)
GPU code name
GK106
Barts
Market segment
Desktop
Desktop
Release date
September 2012
April 2011
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
One 6-pin
2x 6-pin
SLI options
+
-
Boost clock speed
1033 MHz
-
Core clock speed
980 MHz
840 MHz
CUDA cores
960
-
Floating-point performance
1,981 gflops
1,344.0 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
2,540 million
1,700 million
Pipelines / CUDA cores
960
800
Power consumption (TDP)
140 Watt
150 Watt
Texture fill rate
78.4 billion/sec
33.60
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
192-bit GDDR5
256 Bit
Memory clock speed
6.0 GB/s
1050 MHz
Memory bandwidth
144.2 GB/s
134.4 GB/s
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
2x DVI, 1x HDMI, 1x DisplayPort
Multi monitor support
4 displays
-
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
11.2 (11_0)
CUDA
+
-
OpenCL
1.2
1.2
OpenGL
4.3
4.4
Shader Model
5.1
5.0
Vulkan
1.1.126
N/A
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-