I like the reviews of SweClockers.com, but it's in swedish. They try to eliminate bottlenecks and try to isolate the actual perfromance of the cards. They too have an Index, and there you can read that 7970 is 48% faster in 1920x1080 and 2560x1600. The bigger the difference you can get in real world test the less bottlnecks is involved and the closer you are to the real performance difference. They have a number of games where you can see about 60% better performance.
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