A 6570 is a fair amount weaker then a 5750. At ultra at 1920x1080 on a flight path
, which is much less intensive then a busy city or a 25 man raid with the spell detail settings at max
, a 5750 just barely cuts the mustard.
Also it has nothing to do with a Nvidia card. In fact Nvidia cards run amazing on WoW. A GTX 460 is 15 percent weaker
than a 6870, yet does BETTER in WoW than a 6870. So...yeah.