Radeon HD 3850 X2 and GeForce 8800 GTS 640 - video card comparison
Radeon HD 3850 X2
GeForce 8800 GTS 640
Architecture
TeraScale (2005−2013)
Tesla (2006−2010)
GPU code name
RV670
G80
Market segment
Desktop
Desktop
Release date
April 2008
November 2006
Interface
PCIe 2.0 x16
PCIe 1.0 x16
Supplementary power connectors
-
1x 6-pin
Core clock speed
669 MHz
513 MHz
Floating-point performance
2x 428.2 gflops
228.1 gflops
Manufacturing process technology
55 nm
90 nm
Number of transistors
666 million
681 million
Pipelines / CUDA cores
320
96
Power consumption (TDP)
140 Watt
143 Watt
Texture fill rate
10.70
24.62
Memory type
GDDR3
GDDR3
Maximum RAM amount
512 MB
640 MB
Memory bus width
256 Bit
320 Bit
Memory clock speed
1656 MHz
1584 MHz
Memory bandwidth
52.99 GB/s
63.36 GB/s
Display Connectors
2x DVI, 1x S-Video
2x DVI, 1x S-Video
DirectX
10.1 (10_1)
11.1 (10_0)
CUDA
-
+
OpenCL
N/A
1.1
OpenGL
3.3
3.3
Shader Model
4.1
4.0
Vulkan
N/A
N/A