If you want to upgrade your cpu, get a real upgrade, not a crippled processor. As far as sli, well have a great cooling system, and turn off your heater, and kick on your airconditioner your going to need it, what games are you playing that you want to go to sli? Crysis is about the ony justifiable sli game out there right now, if i were you id sell the gt, and upgrade to a gtx.