Radeon HD 3850 and GeForce GT 640 Rev. 2 - video card comparison
Radeon HD 3850
GeForce GT 640 Rev. 2
Architecture
TeraScale (2005−2013)
Kepler 2.0 (2013−2015)
GPU code name
RV670
GK208
Market segment
Desktop
Desktop
Release date
November 2007
May 2013
Interface
PCIe 2.0 x16
PCIe 2.0 x8
Supplementary power connectors
1x 6-pin
None
Core clock speed
668 MHz
1046 MHz
Floating-point performance
427.5 gflops
803.3 gflops
Manufacturing process technology
55 nm
28 nm
Number of transistors
666 million
915 million
Pipelines / CUDA cores
320
384
Power consumption (TDP)
75 Watt
49 Watt
Texture fill rate
10.69
33.47
Memory type
GDDR3
GDDR5
Maximum RAM amount
1 GB
1 GB
Memory bus width
256 Bit
64 Bit
Memory clock speed
1660 MHz
5008 MHz
Memory bandwidth
53.12 GB/s
40.06 GB/s
Display Connectors
2x DVI, 1x S-Video
1x DVI, 1x HDMI, 1x VGA
HDMI
-
+
DirectX
10.1 (10_1)
12 (11_0)
CUDA
-
3.5
OpenCL
N/A
1.2
OpenGL
3.3
4.6
Shader Model
4.1
5.1
Vulkan
N/A
1.1.126