GeForce GT 640 Rev. 2 and Radeon X800 XT - video card comparison
GeForce GT 640 Rev. 2
Radeon X800 XT
Architecture
Kepler 2.0 (2013−2015)
R400 (2004−2008)
GPU code name
GK208
R423
Market segment
Desktop
Desktop
Release date
May 2013
December 2004
Interface
PCIe 2.0 x8
PCIe 1.0 x16
Supplementary power connectors
None
1x 6-pin
Core clock speed
1046 MHz
500 MHz
Floating-point performance
803.3 gflops
-
Manufacturing process technology
28 nm
130 nm
Number of transistors
915 million
160 million
Pipelines / CUDA cores
384
-
Power consumption (TDP)
49 Watt
54 Watt
Texture fill rate
33.47
8.000
Memory type
GDDR5
GDDR3
Maximum RAM amount
1 GB
256 MB
Memory bus width
64 Bit
256 Bit
Memory clock speed
5008 MHz
1000 MHz
Memory bandwidth
40.06 GB/s
32 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x VGA
1x DVI, 1x VGA, 1x S-Video
HDMI
+
-
DirectX
12 (11_0)
9.0b (9_2)
CUDA
3.5
-
OpenCL
1.2
N/A
OpenGL
4.6
2.0
Shader Model
5.1
-
Vulkan
1.1.126
N/A