Radeon HD 3850 X2 and GeForce GT 640 OEM Rebrand - video card comparison
Radeon HD 3850 X2
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
April 2008
April 2012
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Supplementary power connectors
-
None
Core clock speed
669 MHz
720 MHz
Floating-point performance
2x 428.2 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)
140 Watt
75 Watt
Texture fill rate
10.70
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