I just ordered an asrock extreme3 z68 gen3 and it seems to be having some issues with overclocking so I am going to send it back to newegg and get a new one. I thought I might aswell get an upgrade while I was at it looking at the asrock extreme4 z68 gen3 and the asus z68 pro 3 both at about the same price range. I can't decide which one is better. The system has an overclocked i5 with a single 560 ti with a probable 560 ti sli in the future. Which board would be better for what I'm going for, or is there even a difference between the lower extreme3 and these upgraded models.