Radeon HD 2900 XT and GeForce 8800 GTS 640 - video card comparison
Radeon HD 2900 XT
GeForce 8800 GTS 640
Architecture
TeraScale (2005−2013)
Tesla (2006−2010)
GPU code name
R600
G80
Market segment
Desktop
Desktop
Release date
May 2007
November 2006
Interface
PCIe 1.0 x16
PCIe 1.0 x16
Supplementary power connectors
1x 6-pin + 1x 8-pin
1x 6-pin
Core clock speed
743 MHz
513 MHz
Floating-point performance
475.5 gflops
228.1 gflops
Manufacturing process technology
80 nm
90 nm
Number of transistors
720 million
681 million
Pipelines / CUDA cores
320
96
Power consumption (TDP)
215 Watt
143 Watt
Texture fill rate
11.89
24.62
Memory type
GDDR3
GDDR3
Maximum RAM amount
512 MB
640 MB
Memory bus width
512 Bit
320 Bit
Memory clock speed
1656 MHz
1584 MHz
Memory bandwidth
106.0 GB/s
63.36 GB/s
Display Connectors
2x DVI, 1x S-Video
2x DVI, 1x S-Video
DirectX
10.0 (10_0)
11.1 (10_0)
CUDA
-
+
OpenCL
N/A
1.1
OpenGL
3.3
3.3
Shader Model
4.0
4.0
Vulkan
N/A
N/A