GTX 480 > GTX580 the optimisation scaling is 5% average following Nvidia (32SP+ tweaks )... I don't know if the tweaks have the same impact, the rest of the performance gain is coming from the clock speed, and there ofc it will be really different of the GF100-110 cause we don't speak about a 70mhz increase only.
Anway following the move of latest Nvidia 5xx: it's not really hard to imagine where the perf aim .. GTX570 = ~GTX480 perf level ( 1-2%) - GTX560 = ~ GTX470 + 5 % perf level in average....
this will make a nice line in perfs level between 560 +15 % > 570 + 15 % > 580.
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