AMD Radeon HD 7970 X2 vs AMD Radeon HD 6870
GPU Specs Compare
Graphics Card
Release Date
Aug 2012
Oct 2010
Generation
Southern Islands
Northern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 2.0 x16
Clock Speeds
Memory Clock
1375 MHz
1050 MHz
Memory
Memory Size
3GB
1024MB
Memory Type
GDDR5
GDDR5
Memory Bus
384bit
256bit
Bandwidth
264.0GB/s
134.4GB/s
Render Config
Compute Units
32
14
Shading Units
2048
1120
TMUs
128
56
ROPs
32
32
L1 Cache
16 KB (per CU)
8 KB (per CU)
L2 Cache
768 KB
512 KB
Theoretical Performance
Pixel Rate
29.60 GPixel/s
28.80 GPixel/s
Texture Rate
118.4 GTexel/s
50.40 GTexel/s
FP32 (float)
3.789 TFLOPS
2.016 TFLOPS
FP64 (double)
947.2 GFLOPS
-
Graphics Processor
GPU Name
New Zealand
Barts
Architecture
GCN 1.0
TeraScale 2
Foundry
TSMC
TSMC
Process Size
28 nm
40 nm
Transistors
4.313 billion
1.7 billion
Die Size
352 mm²
255 mm²
GPU Variant
-
Barts XT(215-0798000)
Board Design
TDP
500W
151W
Suggested PSU
900 W
450 W
Outputs
2x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
2x DVI1x HDMI 1.3a2x mini-DisplayPort 1.1
Power Connectors
3x 8-pin
2x 6-pin
Graphics Features
DirectX
12 (11_1)
11.2 (11_0)
OpenGL
4.6
4.4
OpenCL
1.2
1.2
Vulkan
1.2
N/A
Shader Model
5.1
5.0