Even though this question is solved I want to add that WoW can get insanely CPU intensive if you go into 25 man raids. WoW runs great on a lot of hardware if you're out in the wild, but having many people on screen or lots of spell effects in raiding will put a SERIOUS strain on your CPU.
I have an i5 2500 (3.3Ghz) and an OC GTX770 and whilst the GPU is complete overkill for WoW I do dip below 30 fps sometimes when I am in very crowded areas. Do not underestimate the CPU hunger of WoW.