I run a ATI5870 and 8800GTS in the same box, 3 monitors on the 5870 and 2 on the 8800 it works fine i can run main on full setting and other on lower setting i lock fps at 30 on main and 15 on others i could get more fps but you don't really need it in WoW.

I find the cards work well together, i'm using IS Boxer.


My system is i7 920 with 12gb Ram, and running wow on a intel SSD. I run 5 account at once each full screen on each of the 5 screens.