I'm considering building a new PC and using an i7 920 and a single gtx 275, using 12gb ram and vista (or windows 7 actually) - I'd like to confirm that this is enough - including not having lag in dalaran - or maybe that 2 sli card can actually be beneficial or not : Jafula in your case/disappointment - maybe it had to do with not having 2x the same card ? which OS were your using ?