hey everyone, I just bought a pc , a rather nice one imo ( i5 3570k, 16gb 1600mhz corsair ocz850w gold asus z77 sabertooth / gtx 670 reference card non oc atm im going to Sli, but what card should I use to do that?? if possible id rather get a non reference cooler for the top card as it will be taking on more heat ( pc is non water cooled ) I was thinking of an Asus Dc II... any suggestions??