(first post here, so hi!)

I'm running a fairly decent machine. dual core 2.2, 3.5 gigs of ram, and SLI 7800s. Every game runs beautifully, with framerates rarely dropping below 50-60. Wow, however, is ripping my machine to shreds.
I'm rarely at even 20 fps in raids, and I rarely go over 40 fps in the world. While acceptable, it's pissing me off because I know my machine is more capable than this.

I've run temperature tests, made sure everything was set to proper speeds, updated drivers and reinstalled. Nothing is seeming to work.
Does anyone have any idea what the problem could be, or perhaps some performance tweaking I could do to make my raiding experience a bit more.. tolerable?