Radeon HD 3850 AGP and GeForce GT 640 OEM Rebrand - video card comparison
Radeon HD 3850 AGP
GeForce GT 640 OEM Rebrand
Architecture
TeraScale (2005−2013)
Fermi 2.0 (2010−2014)
GPU code name
RV670
GF116
Market segment
Desktop
Desktop
Release date
January 2008
April 2012
Interface
AGP 8x
PCIe 2.0 x16
Supplementary power connectors
1x 8-pin
None
Core clock speed
668 MHz
720 MHz
Floating-point performance
427.5 gflops
414.7 gflops
Manufacturing process technology
55 nm
40 nm
Number of transistors
666 million
1,170 million
Pipelines / CUDA cores
320
144
Power consumption (TDP)
75 Watt
75 Watt
Texture fill rate
10.69
17.28
Memory type
GDDR3
DDR3
Maximum RAM amount
512 MB
1536 MB
Memory bus width
256 Bit
192 Bit
Memory clock speed
1656 MHz
1600 MHz
Memory bandwidth
52.99 GB/s
38.4 GB/s
Display Connectors
2x DVI, 1x S-Video
2x DVI, 1x mini-HDMI
HDMI
-
+
DirectX
10.1 (10_1)
12 (11_0)
CUDA
-
2.1
OpenCL
N/A
1.1
OpenGL
3.3
4.6
Shader Model
4.1
5.1
Vulkan
N/A
N/A