GeForce GTX 660 and Radeon X850 XT - video card comparison
Passmark - benchmark score GeForce GTX 660 vs Radeon X850 XT
GeForce GTX 660
4119
Radeon X850 XT
83
GeForce GTX 660
Radeon X850 XT
Architecture
Kepler (2012−2018)
R400 (2004−2008)
GPU code name
GK106
R480
Market segment
Desktop
Desktop
Release date
September 2012
December 2004
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 1.0 x16
Supplementary power connectors
One 6-pin
1x 6-pin
SLI options
+
-
Boost clock speed
1033 MHz
-
Core clock speed
980 MHz
520 MHz
CUDA cores
960
-
Floating-point performance
1,981 gflops
-
Manufacturing process technology
28 nm
130 nm
Number of transistors
2,540 million
160 million
Pipelines / CUDA cores
960
-
Power consumption (TDP)
140 Watt
69 Watt
Texture fill rate
78.4 billion/sec
8.320
Memory type
GDDR5
GDDR3
Maximum RAM amount
2 GB
256 MB
Memory bus width
192-bit GDDR5
256 Bit
Memory clock speed
6.0 GB/s
1080 MHz
Memory bandwidth
144.2 GB/s
34.56 GB/s
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
2x DVI, 1x S-Video
Multi monitor support
4 displays
-
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
9.0b (9_2)
CUDA
+
-
OpenCL
1.2
N/A
OpenGL
4.3
2.0
Shader Model
5.1
-
Vulkan
1.1.126
N/A
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-