GeForce GTX 660 OEM and Radeon X1900 CrossFire Edition - video card comparison
GeForce GTX 660 OEM
Radeon X1900 CrossFire Edition
Architecture
Kepler (2012−2018)
R500 (2005−2007)
GPU code name
GK104
R580
Market segment
Desktop
Desktop
Release date
August 2012
January 2006
Interface
PCIe 3.0 x16
PCIe 1.0 x16
Supplementary power connectors
1x 6-pin
1x 6-pin
Boost clock speed
888 MHz
-
Core clock speed
823 MHz
625 MHz
Floating-point performance
2,046 gflops
-
Manufacturing process technology
28 nm
90 nm
Number of transistors
3,540 million
384 million
Pipelines / CUDA cores
1152
-
Power consumption (TDP)
130 Watt
100 Watt
Texture fill rate
85.25
10.00
Memory type
GDDR5
GDDR3
Maximum RAM amount
2 GB
512 MB
Memory bus width
256 Bit
256 Bit
Memory clock speed
5600 MHz
1450 MHz
Memory bandwidth
179.2 GB/s
46.4 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
2x DVI, 1x S-Video
HDMI
+
-
DirectX
12 (11_0)
9.0c (9_3)
CUDA
3.0
-
OpenCL
1.2
N/A
OpenGL
4.6
2.0
Shader Model
5.1
3.0
Vulkan
1.1.126
N/A