Hi im looking to buy either a gtx 570, 589 or a 590. by looking at the 590 its miles ahead of the other two in frames per second! why arent people getting this instead of a 580? when the performance boost is so big compared to a 570-580 to a 590. anyways i would want to play the game on high settings everything maxed is not something i need i just dont want lag & drops when playing