It should be just fine. What I am saying is, that it would be the bottleneck in the system that does not let you FPS go higher. Getting a new links (4770K OC'ed) in a chain but leaving one weaker link (GTX 660Ti), will still lack strength because of that one link, if that makes sense.
WoW does not care about HT, and does not care about a lot of cores, it does care about having FAST cores. OC what you have, and you should see a big improvement in crowded areas. That is assuming you don't have your settings to high for your GPU.
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.