AMD Radeon HD 8870 OEM vs AMD Radeon HD 6990M
GPU Specs Compare
Graphics Card
Release Date
Jan 2013
Jul 2011
Generation
Sea Islands
Vancouver
Type
Desktop
Mobile
Bus Interface
PCIe 3.0 x16
MXM-B (3.0)
Clock Speeds
Memory Clock
1200 MHz
900 MHz
Memory
Memory Size
2GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
256bit
Bandwidth
153.6GB/s
115.2GB/s
Render Config
Compute Units
20
14
Shading Units
1280
1120
TMUs
80
56
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
22.88 GPixel/s
Texture Rate
80.00 GTexel/s
40.04 GTexel/s
FP32 (float)
2.560 TFLOPS
1.602 TFLOPS
FP64 (double)
160.0 GFLOPS
-
Graphics Processor
GPU Name
Pitcairn
Blackcomb
GPU Variant
Pitcairn XT(215-0828047)
Blackcomb XTX(216-0811030)
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
212 mm²
Board Design
TDP
175W
100W
Suggested PSU
450 W
-
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
No outputs
Power Connectors
2x 6-pin
None
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