AMD Radeon HD 6990M vs AMD Radeon HD 7870 GHz Edition
GPU Specs Compare
Graphics Card
Release Date
Jul 2011
Mar 2012
Generation
Vancouver
Southern Islands
Type
Mobile
Desktop
Bus Interface
MXM-B (3.0)
PCIe 3.0 x16
Clock Speeds
Memory Clock
900 MHz
1200 MHz
Memory
Memory Size
2GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
256bit
Bandwidth
115.2GB/s
153.6GB/s
Render Config
Compute Units
14
20
Shading Units
1120
1280
TMUs
56
80
ROPs
32
32
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
512 KB
Theoretical Performance
Pixel Rate
22.88 GPixel/s
32.00 GPixel/s
Texture Rate
40.04 GTexel/s
80.00 GTexel/s
FP32 (float)
1.602 TFLOPS
2.560 TFLOPS
FP64 (double)
-
160.0 GFLOPS
Graphics Processor
GPU Name
Blackcomb
Pitcairn
GPU Variant
Blackcomb XTX(216-0811030)
Pitcairn XT(215-0828047)
Architecture
TeraScale 2
GCN 1.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
1.7 billion
2.8 billion
Die Size
212 mm²
212 mm²
Board Design
TDP
100W
175W
Outputs
No outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Power Connectors
None
2x 6-pin
Suggested PSU
-
450 W
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