Radeon HD 6870 X2 and GeForce 8400 GS - video card comparison
Radeon HD 6870 X2
GeForce 8400 GS
Architecture
TeraScale 2 (2009−2015)
Tesla (2006−2010)
GPU code name
Barts
G86
Market segment
Desktop
Desktop
Release date
July 2011
April 2007
Interface
PCIe 2.0 x16
PCIe 1.0 x16
Supplementary power connectors
-
None
SLI options
-
+
Core clock speed
900 MHz
459 MHz
Floating-point performance
2x 2,016.0 gflops
29.376 gflops
Manufacturing process technology
40 nm
80 nm
Number of transistors
1,700 million
210 million
Pipelines / CUDA cores
1120
16
Power consumption (TDP)
300 Watt
40 Watt
Texture fill rate
50.40
3.6 billion/sec
Memory type
GDDR5
DDR2
Maximum RAM amount
1 GB
256 MB
Memory bus width
256 Bit
64 Bit
Memory clock speed
4200 MHz
800 MHz
Memory bandwidth
134.4 GB/s
6.4 GB/s
Standard memory config per GPU
-
256 MB
Display Connectors
2x DVI, 1x HDMI, 2x mini-DisplayPort
1x DVI, 1x VGA, 1x S-Video
HDMI
+
-
DirectX
11.2 (11_0)
11.1 (10_0)
CUDA
-
1.1
OpenCL
1.2
1.1
OpenGL
4.4
2.1
Shader Model
5.0
4.0
Vulkan
N/A
N/A