cpu by a huge mile, all mmos are far more cpu hungry then a gpu, not to say a gpu isnt that important, in the world of mmos its cpu, theres a lot of info that needs to be dealt with and player actions on screen, thats something that isnt dealt with by the gpu, this is coming from a mmo player that had a phenom 2 before from 3.4ghz oced to 3.9, and went to a I5 3570k 4.4 ghz stable, can push for more but need a better motherboard to do that, all with decent temps and silence, gpus get cheaper anyways, also advice, the element you will gain is minimum FPS when shit hits the fan so to speak