GeForce GT 640 and GeForce GT 640 Rev. 2 - video card comparison
GeForce GT 640
GeForce GT 640 Rev. 2
Architecture
Kepler (2012−2018)
Kepler 2.0 (2013−2015)
GPU code name
GK107
GK208
Market segment
Desktop
Desktop
Release date
June 2012
May 2013
Interface
PCIe 3.0 x16
PCIe 2.0 x8
Supplementary power connectors
None
None
Core clock speed
902 MHz
1046 MHz
Floating-point performance
692.7 gflops
803.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
915 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
65 Watt
49 Watt
Texture fill rate
28.86
33.47
Memory type
DDR3
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
1782 MHz
5008 MHz
Memory bandwidth
28.51 GB/s
40.06 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 1x HDMI, 1x VGA
HDMI
+
+
DirectX
12 (11_0)
12 (11_0)
CUDA
3.0
3.5
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126