Radeon HD 6870 X2 and GeForce GTX 555 OEM - video card comparison
Radeon HD 6870 X2
GeForce GTX 555 OEM
Architecture
TeraScale 2 (2009−2015)
Fermi 2.0 (2010−2014)
GPU code name
Barts
GF114
Market segment
Desktop
Desktop
Release date
July 2011
May 2011
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Supplementary power connectors
-
2x 6-pin
Core clock speed
900 MHz
736 MHz
Floating-point performance
2x 2,016.0 gflops
847.9 gflops
Manufacturing process technology
40 nm
40 nm
Number of transistors
1,700 million
1,950 million
Pipelines / CUDA cores
1120
288
Power consumption (TDP)
300 Watt
150 Watt
Texture fill rate
50.40
35.33
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
1 GB
Memory bus width
256 Bit
192 Bit
Memory clock speed
4200 MHz
3828 MHz
Memory bandwidth
134.4 GB/s
91.87 GB/s
Display Connectors
2x DVI, 1x HDMI, 2x mini-DisplayPort
2x DVI, 1x mini-HDMI
HDMI
+
+
DirectX
11.2 (11_0)
12 (11_0)
CUDA
-
2.1
OpenCL
1.2
1.1
OpenGL
4.4
4.6
Shader Model
5.0
5.1
Vulkan
N/A
N/A