AMD Radeon HD 6990 vs AMD Radeon HD 7950 Mac Edition
GPU Specs Compare
Graphics Card
Release Date
Mar 2011
Mar 2013
Generation
Northern Islands
Southern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1250 MHz
1250 MHz
Memory
Memory Size
2GB
3GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
384bit
Bandwidth
160.0GB/s
240.0GB/s
Render Config
Compute Units
24
28
Shading Units
1536
1792
TMUs
96
112
ROPs
32
32
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
768 KB
Theoretical Performance
Pixel Rate
26.56 GPixel/s
25.60 GPixel/s
Texture Rate
79.68 GTexel/s
89.60 GTexel/s
FP32 (float)
2.550 TFLOPS
2.867 TFLOPS
FP64 (double)
637.4 GFLOPS
716.8 GFLOPS
Graphics Processor
GPU Name
Antilles
Tahiti
GPU Variant
Antilles XT(215-0807027)
Tahiti PRO(215-0821056)
Architecture
TeraScale 3
GCN 1.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
2.64 billion
4.313 billion
Die Size
389 mm²
352 mm²
Board Design
TDP
375W
200W
Suggested PSU
750 W
550 W
Outputs
1x DVI4x mini-DisplayPort 1.2
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Power Connectors
2x 8-pin
2x 6-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