GeForce GT 640 Rev. 2 and Mobility Radeon HD 4850 X2 - video card comparison
GeForce GT 640 Rev. 2
Mobility Radeon HD 4850 X2
Architecture
Kepler 2.0 (2013−2015)
TeraScale (2005−2013)
GPU code name
GK208
M98
Market segment
Desktop
Desktop
Release date
May 2013
January 2009
Interface
PCIe 2.0 x8
PCIe 2.0 x16
Supplementary power connectors
None
-
Core clock speed
1046 MHz
500 MHz
Floating-point performance
803.3 gflops
2x 800.0 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
915 million
956 million
Pipelines / CUDA cores
384
800
Power consumption (TDP)
49 Watt
-
Texture fill rate
33.47
20.00
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
1 GB
Memory bus width
64 Bit
256 Bit
Memory clock speed
5008 MHz
2800 MHz
Memory bandwidth
40.06 GB/s
89.6 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x VGA
No outputs
HDMI
+
-
DirectX
12 (11_0)
10.1 (10_1)
CUDA
3.5
-
OpenCL
1.2
1.1
OpenGL
4.6
3.3
Shader Model
5.1
4.1
Vulkan
1.1.126
N/A