The Q6600 was/is a beast, imho there is no excuse to let it drag its feet at stock frequencies. I'm glad my most concise advice did the trick

I could be mistaken on how WoW handles multiple cores. A year and a half ago, I did extensive searches regarding this and that was my conclusion based off numerous tech support blue comments. I also ran a few tests of my own design. If there have been changes, I've missed them.

I might run a few test scenarios to see how outdated I am.