GeForce GT 640 and GeForce GTX 645 OEM - video card comparison
GeForce GT 640
GeForce GTX 645 OEM
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
GK107
GK106
Market segment
Desktop
Desktop
Release date
June 2012
April 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
None
None
Core clock speed
902 MHz
824 MHz
Floating-point performance
692.7 gflops
949.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
2,540 million
Pipelines / CUDA cores
384
576
Power consumption (TDP)
65 Watt
65 Watt
Texture fill rate
28.86
39.55
Memory type
DDR3
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
128 Bit
128 Bit
Memory clock speed
1782 MHz
4000 MHz
Memory bandwidth
28.51 GB/s
64 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
DirectX
12 (11_0)
12 (11_0)
CUDA
3.0
3.0
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126