AMD Radeon Sky 900 vs AMD Radeon HD 7990
GPU Specs Compare
Graphics Card
Release Date
Mar 2013
Apr 2013
Generation
Radeon Sky
Southern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Base Clock
825 MHz
950 MHz
Boost Clock
950 MHz
1000 MHz
Memory Clock
1250 MHz
1500 MHz
Memory
Memory Size
3GB
3GB
Memory Type
GDDR5
GDDR5
Memory Bus
384bit
384bit
Bandwidth
240.0GB/s
288.0GB/s
Render Config
Compute Units
28
32
Shading Units
1792
2048
TMUs
112
128
ROPs
32
32
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
768 KB
768 KB
Theoretical Performance
Pixel Rate
30.40 GPixel/s
32.00 GPixel/s
Texture Rate
106.4 GTexel/s
128.0 GTexel/s
FP32 (float)
3.405 TFLOPS
4.096 TFLOPS
FP64 (double)
851.2 GFLOPS
1024 GFLOPS
Graphics Processor
GPU Name
Tahiti
Malta
GPU Variant
Orthrus
Malta XT(215-0849026)
Architecture
GCN 1.0
GCN 1.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
4.313 billion
4.313 billion
Die Size
352 mm²
365 mm²
Board Design
TDP
300W
375W
Suggested PSU
700 W
750 W
Outputs
1x DVI1x mini-DisplayPort 1.2
1x DVI4x mini-DisplayPort 1.2
Power Connectors
2x 8-pin
2x 8-pin
Graphics Features
DirectX
12 (11_1)
12 (11_1)
OpenGL
4.6
4.6
OpenCL
1.2
1.2
Vulkan
1.2
1.2
Shader Model
5.1
5.1