GeForce GT 640 and Mobility Radeon HD 4850 - video card comparison
GeForce GT 640
Mobility Radeon HD 4850
Architecture
Kepler (2012−2018)
Terascale 1 (2008−2010)
GPU code name
GK107
M98
Market segment
Desktop
Laptop
Release date
June 2012
January 2009
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
None
-
Core clock speed
902 MHz
500 MHz
Floating-point performance
692.7 gflops
800.0 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
1,270 million
956 million
Pipelines / CUDA cores
384
800
Power consumption (TDP)
65 Watt
-
Texture fill rate
28.86
20.00
Memory type
DDR3
GDDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
128 Bit
256 Bit
Memory clock speed
1782 MHz
850 MHz
Memory bandwidth
28.51 GB/s
54.4 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
-
DirectX
12 (11_0)
10.1 (10_1)
CUDA
3.0
-
OpenCL
1.2
1.1
OpenGL
4.6
3.3
Shader Model
5.1
4.1
Vulkan
1.1.126
N/A