Mistwalker
Senior member
Though it's little more than semantics, technically RussianSensation has it right.
The 5870 provides on average 75% of the 580's performance.
The 580 is therefore on average 33% faster than the 5870 (except at 2560x1600 8xAA/16xAF, where it is considerably faster).
Really though, stating x is y% faster than z so the 6970 needs to be n% faster to compete...the fact is we don't have enough information to assume anything. One vendor gave an extremely wide percentage range that itself may not be accurate. It sucks but we need to wait for more solid numbers, gentlemen.