Radeon HD 3850 and GeForce GT 640 OEM - video card comparison
Radeon HD 3850
GeForce GT 640 OEM
Architecture
TeraScale (2005−2013)
Kepler (2012−2018)
GPU code name
RV670
GK107
Market segment
Desktop
Desktop
Release date
November 2007
April 2012
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
None
Core clock speed
668 MHz
797 MHz
Floating-point performance
427.5 gflops
612.1 gflops
Manufacturing process technology
55 nm
28 nm
Number of transistors
666 million
1,270 million
Pipelines / CUDA cores
320
384
Power consumption (TDP)
75 Watt
50 Watt
Texture fill rate
10.69
25.50
Memory type
GDDR3
DDR3
Maximum RAM amount
1 GB
2 GB
Memory bus width
256 Bit
128 Bit
Memory clock speed
1660 MHz
1782 MHz
Memory bandwidth
53.12 GB/s
28.51 GB/s
Display Connectors
2x DVI, 1x S-Video
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
-
+
DirectX
10.1 (10_1)
12 (11_0)
CUDA
-
3.0
OpenCL
N/A
1.2
OpenGL
3.3
4.6
Shader Model
4.1
5.1
Vulkan
N/A
1.1.126