AMD Radeon HD 6870 X2 vs AMD Radeon Sky 900
GPU · Specs Compare
Graphics Card
Release Date
Jul 2011
Mar 2013
Generation
Northern Islands
Radeon Sky
Type
Desktop
Desktop
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1050 MHz
1250 MHz
Base Clock
—
825 MHz
Boost Clock
—
950 MHz
Memory
Memory Size
1024MB
3GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
384bit
Bandwidth
134.4GB/s
240.0GB/s
Render Config
Compute Units
14
28
Shading Units
1120
1792
TMUs
56
112
ROPs
32
32
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
768 KB
Theoretical Performance
Pixel Rate
28.80 GPixel/s
30.40 GPixel/s
Texture Rate
50.40 GTexel/s
106.4 GTexel/s
FP32 (float)
2.016 TFLOPS
3.405 TFLOPS
FP64 (double)
—
851.2 GFLOPS
Graphics Processor
GPU Name
Barts
Tahiti
GPU Variant
Barts XT(215-0798000)
Orthrus
Architecture
TeraScale 2
GCN 1.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
1.7 billion
4.313 billion
Die Size
255 mm²
352 mm²
Board Design
TDP
300W
300W
Suggested PSU
700 W
700 W
Outputs
2x DVI1x HDMI 1.3a2x mini-DisplayPort 1.1
1x DVI1x mini-DisplayPort 1.2
Power Connectors
—
2x 8-pin
Graphics Features
DirectX
11.2 (11_0)
12 (11_1)
OpenGL
4.4
4.6
OpenCL
1.2
1.2
Vulkan
N/A
1.2
Shader Model
5.0
5.1
▲ Specs Compare
Data sourced from official specifications and benchmark tests.