ohrite lol, but seriously a 512 and 256 card are one in the same, minute differences in framerate from what ive seen, but only difference is the 512 card has a higher definition in the graphics and makes the games look smexier, but as for framerate meh its the proccesor

also the amount of money you pay extra for a 512 is wasted imo because its such a small difference

ye i dont have duel core but its still prity fast...3.06 Ghz is quite fast....