GeForce GTX 660 and Radeon HD 6850 - video card comparison
Passmark - benchmark score GeForce GTX 660 vs Radeon HD 6850
GeForce GTX 660
4119
Radeon HD 6850
2030
GeForce GTX 660
Radeon HD 6850
Architecture
Kepler (2012−2018)
TeraScale 2 (2009−2015)
GPU code name
GK106
Barts
Market segment
Desktop
Desktop
Release date
September 2012
October 2010
Bus support
PCI Express 3.0
AGP
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
One 6-pin
1x 6-pin
SLI options
+
-
Boost clock speed
1033 MHz
-
Core clock speed
980 MHz
-
CUDA cores
960
-
Floating-point performance
1,981 gflops
1,488.0 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
2,540 million
1,700 million
Pipelines / CUDA cores
960
960
Power consumption (TDP)
140 Watt
127 Watt
Texture fill rate
78.4 billion/sec
37.20
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
-
Memory bandwidth
144.2 GB/s
128.0 GB/s
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
2x DVI, 1x HDMI, 2x mini-DisplayPort
Multi monitor support
4 displays
-
Eyefinity
-
1
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
DisplayPort support
-
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
DirectX® 11
CUDA
+
-
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.3
4.4
Shader Model
5.1
5.0
Vulkan
1.1.126
-
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-
AppAcceleration
-
-
CrossFire
-
1
Enduro
-
-
HD3D
-
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-