you defiantly should have MORE than enough power to play a single wow maxed out. I have a beefy system as well. But when i box 5+ i noticed a BIG improvement as I added more ram. I started with 4 and went up to 12. Was night and day dif, especially in WG or Dalaran. I keep my main screen at max details and the alts on low.
Core I 920
GF280GTX
12gigs DDR3 ram
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