Comparison of Radeon HD 6990 and Radeon HD 7990

Attribute	Radeon HD 7990 ×	Radeon HD 6990 ×
GPU
Release year (year)	2013	2011
Reference card	AMD Radeon HD 7990 950 MHz 6 GB	AMD Radeon HD 6990 830 MHz 4 GB
GPU brand	AMD	AMD
GPU name	Malta	Antilles
Market	Desktop	Desktop
Clock speed (MHz)	950	830
Turbo clock speed (MHz)	1,000	-
Is dual GPU	+	+
Model	Radeon HD 7990	Radeon HD 6990
Memory
Memory (MB)	6,144	4,096
Memory bandwidth (GB/s)	576	320
Memory bus (bit)	768	512
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	1,500	1,250
Effective memory clock speed (MHz)	6,000	5,000
Noise and power
TDP (W)	375	375
Load power consumption (W)	573	545
Idle power consumption (W)	135	140
Load noise level (dB)	60	66
Idle noise level (dB)	43	45.5
Raw performance
Pixel rate (GPixel/s)	64	53.12
Render output processors	64	64
Texture mapping units	256	192
Shading units	4,096	3,072
Floating-point performance (GFLOPS)	8,192	5,100
Compute units	64	48
Texture rate (GTexel/s)	256	159.4
Benchmarks
Cloud Gate Factor	23	21.43
Face detection (mPixels/s)	90.43	17.28
T-Rex (GFXBench 3.0)	3356.38	3356.28
Manhattan (GFXBench 3.0)	3716.14	3713.7
Bitcoin mining (mHash/s)	458.53	265.3
Sky Diver Factor	393.8	340.31
Fire Strike Factor	75.52	45.35
Ocean surface simulation (frames/s)	1833.02	840.45