Comparison of Radeon HD 6990M and Radeon HD 6970M Mac

Attribute	Radeon HD 6990M ×	Radeon HD 6970M Mac ×
GPU
Release year (year)	2011	2011
GPU brand	AMD	AMD
GPU name	Blackcomb	Blackcomb
Market	Laptop	Laptop
Clock speed (MHz)	715	680
Is dual GPU	-	-
Model	Radeon HD 6990M	Radeon HD 6970M Mac
Memory
Memory (MB)	2,048	2,048
Memory bandwidth (GB/s)	115.2	115.2
Memory bus (bit)	256	256
Memory type	GDDR5	GDDR5
Memory clock speed (MHz)	900	900
Effective memory clock speed (MHz)	3,600	3,600
Noise and power
TDP (W)	100	75
Raw performance
Pixel rate (GPixel/s)	22.88	21.76
Render output processors	32	32
Texture mapping units	56	48
Shading units	1,120	960
Floating-point performance (GFLOPS)	1,602	1,306
Compute units	14	12
Texture rate (GTexel/s)	40	32.6
Benchmarks
Battlefield 3	21.9	-
Dirt3	39.4	-
Crysis 2	35	-