I have vista 64, 3lcd, two ati 3870's, intel q6600, 8gig ram, running 5 wow folders symlinked off a raptor drive. I have done everything possible to get fps out of this system. The two accounts that run on the same cpu affinity get much lower fps than the others. At this point I would advise you to go i7, lots of ram, hard drives in raid, and best video card you can buy. The only thing I can do to speed up my system is to run folders from multiple hard drives or use a raid. I am not happy with the fps I get. Everything is set to low for graphics. If you plan on 5 boxing make sure to get a great system. Wotlk killed me on fps. BC was smooth even in shat. Woltk needs more power.

I am shopping now to gut one of my older pc's so I can run 3 accounts on 1 pc and 2 on the other. That should give me smooth game play. Plus I can bump up the graphics detail. It really sucks playing on low with the smallest view distance.