That 5-12% is rather close to 4... also it costs 700 bucks in Hungary... my entire computer was 700 bucks a year ago (about 550 in the states) and runs AH with just the same 60fps with all the eye candy on as the 680.
Where it really overtakes the AMD's product is the power consumption. I would recommend this card over the HD7970.
A GTX570 or a HD 6950 is enough to run any game fully detailed at a playable frame rate. This card is for the tomorrow's games, its awesome, but honestly i wouldnt buy it.