GeForce GT 640 Rev. 2 and Radeon X1800 GTO - video card comparison
GeForce GT 640 Rev. 2
Radeon X1800 GTO
Architecture
Kepler 2.0 (2013−2015)
R500 (2005−2007)
GPU code name
GK208
R520
Market segment
Desktop
Desktop
Release date
May 2013
March 2006
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
90 nm
Number of transistors
915 million
321 million
Pipelines / CUDA cores
384
-
Power consumption (TDP)
49 Watt
48 Watt
Texture fill rate
33.47
6.000
Memory type
GDDR5
GDDR3
Maximum RAM amount
1 GB
256 MB
Memory bus width
64 Bit
256 Bit
Memory clock speed
5008 MHz
990 MHz
Memory bandwidth
40.06 GB/s
31.68 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x VGA
2x DVI, 1x S-Video
HDMI
+
-
DirectX
12 (11_0)
9.0c (9_3)
CUDA
3.5
-
OpenCL
1.2
N/A
OpenGL
4.6
2.0
Shader Model
5.1
3.0
Vulkan
1.1.126
N/A