Dude, if you want to build an SLI, build it right. If you arent a high intense gamer then you dont erven need it. The only reason you would get SLI is with graphic intensive things and if you arent, then don;t build SLI so you can say you have one. Two 6600's would lose in benchmarks to 1 6800 ultra. The processor should be better if it's SLI. I would save up more money if you are really going to buy it.