Radeon HD 6990 and GeForce GTX 660 - video card comparison
Passmark - benchmark score Radeon HD 6990 vs GeForce GTX 660
Radeon HD 6990
3103
GeForce GTX 660
4119
Radeon HD 6990
GeForce GTX 660
Architecture
TeraScale 3 (2010−2013)
Kepler (2012−2018)
GPU code name
Antilles
GK106
Market segment
Desktop
Desktop
Release date
March 2011
September 2012
Bus support
-
PCI Express 3.0
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 8-pin
One 6-pin
SLI options
-
+
Boost clock speed
-
1033 MHz
Core clock speed
830 MHz
980 MHz
CUDA cores
-
960
Floating-point performance
2x 2,549.8 gflops
1,981 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
2,640 million
2,540 million
Pipelines / CUDA cores
1536
960
Power consumption (TDP)
375 Watt
140 Watt
Texture fill rate
79.68
78.4 billion/sec
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
256 Bit
192-bit GDDR5
Memory clock speed
5000 MHz
6.0 GB/s
Memory bandwidth
160.0 GB/s
144.2 GB/s
Display Connectors
1x DVI, 4x mini-DisplayPort
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
Multi monitor support
-
4 displays
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
2048x1536
Audio input for HDMI
-
Internal
DirectX
11.2 (11_0)
12 (11_0)
CUDA
-
+
OpenCL
1.2
1.2
OpenGL
4.4
4.3
Shader Model
5.0
5.1
Vulkan
N/A
1.1.126
3D Blu-Ray
-
+
3D Gaming
-
+
3D Vision
-
+