AMD Radeon HD 8870 OEM vs AMD Radeon HD 6850
GPU Specs Compare
Graphics Card
Release Date
Jan 2013
Oct 2010
Generation
Sea Islands
Northern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 2.0 x16
Clock Speeds
Memory Clock
1200 MHz
1000 MHz
Memory
Memory Size
2GB
1024MB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
256bit
Bandwidth
153.6GB/s
128.0GB/s
Render Config
Compute Units
20
12
Shading Units
1280
960
TMUs
80
48
ROPs
32
32
L1 Cache
16 KB (per CU)
8 KB (per CU)
L2 Cache
512 KB
512 KB
Theoretical Performance
Pixel Rate
32.00 GPixel/s
24.80 GPixel/s
Texture Rate
80.00 GTexel/s
37.20 GTexel/s
FP32 (float)
2.560 TFLOPS
1488 GFLOPS
FP64 (double)
160.0 GFLOPS
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Graphics Processor
GPU Name
Pitcairn
Barts
GPU Variant
Pitcairn XT(215-0828047)
Barts PRO(215-0798006)
Architecture
GCN 1.0
TeraScale 2
Foundry
TSMC
TSMC
Process Size
28 nm
40 nm
Transistors
2.8 billion
1.7 billion
Die Size
212 mm²
255 mm²
Board Design
TDP
175W
127W
Suggested PSU
450 W
300 W
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
2x DVI1x HDMI 1.3a2x mini-DisplayPort 1.1
Power Connectors
2x 6-pin
1x 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