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Pemalite said:

My point went completely over your head, but nice attempt anyway.

http://www.anandtech.com/bench/Product/293?vs=294

Performance+die size per watt is better on the 6900 series, note: That includes both the 6950 and 6970.

Yeap.... the permance/watt of HD 6900 is better than HD 5800... there are improviments here but there is no miracle the HD 6900 consumes more than HD 5800.

From your link (Load consumption)...

HD 6970 (880/5500Mhz): 340w
HD 5870 (850/4800Mhz): 310w
HD 6950 (800/5000Mhz): 292w
HD 5850 (725/4000Mhz): 277w

The Volcanic Islands will have better performance but the consumption will be higher too.