hi..
well i got 580 gtx, i7 2600k@ 4.8 ghz, 4gb ram, asus p8p67
and i get fps drops outside from 60 to 45, i'm trying to disable vsync but it wont effect the game
any idea why it happens?

http://www.gamesas.com/index.php?/topic/1255788-gtx580-users-thread/

You are saying u got fps drops at the begining as well? im at the hanging part, and when u continued to play u got it back to 60 fps? O_O