GeForce GT 640 Rev. 2 and Radeon R7 250 OEM - video card comparison
GeForce GT 640 Rev. 2
Radeon R7 250 OEM
Architecture
Kepler 2.0 (2013−2015)
GCN 1.0 (2012−2020)
GPU code name
GK208
Oland
Market segment
Desktop
Desktop
Release date
May 2013
October 2013
Interface
PCIe 2.0 x8
PCIe 3.0 x8
Supplementary power connectors
None
None
Boost clock speed
-
1050 MHz
Core clock speed
1046 MHz
1000 MHz
Floating-point performance
803.3 gflops
806.4 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
915 million
950 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
49 Watt
65 Watt
Texture fill rate
33.47
25.20
Memory type
GDDR5
DDR3
Maximum RAM amount
1 GB
2 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
5008 MHz
2000 MHz
Memory bandwidth
40.06 GB/s
32 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x VGA
1x DVI, 1x HDMI, 1x VGA
HDMI
+
+
DirectX
12 (11_0)
12 (11_1)
CUDA
3.5
-
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.2.131