GeForce GT 640 Rev. 2 and GF108 - video card comparison
GeForce GT 640 Rev. 2
GF108
Architecture
Kepler 2.0 (2013−2015)
Fermi (2010−2014)
GPU code name
GK208
GF108
Market segment
Desktop
Desktop
Release date
May 2013
-
Interface
PCIe 2.0 x8
-
Supplementary power connectors
None
-
Core clock speed
1046 MHz
-
Floating-point performance
803.3 gflops
-
Manufacturing process technology
28 nm
40 nm
Number of transistors
915 million
585 million
Pipelines / CUDA cores
384
96
Power consumption (TDP)
49 Watt
-
Texture fill rate
33.47
-
Memory type
GDDR5
-
Maximum RAM amount
1 GB
-
Memory bus width
64 Bit
-
Memory clock speed
5008 MHz
-
Memory bandwidth
40.06 GB/s
-
Display Connectors
1x DVI, 1x HDMI, 1x VGA
-
HDMI
+
-
DirectX
12 (11_0)
12 (11_0)
CUDA
3.5
2.1
OpenCL
1.2
1.1
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
PureVideo HD
-
VP4