So, building a new rig in the near future, and obviously I need to pick an OS. I could go with a copy of XP pro, but I really want to take advantage of direct x 10 so it looks like I'm going to get a copy of vista. The mobo I'm going with is an eVGA 680i sli that supports 8 gigs of ddr 1200 in 64 bit mode. Obviously I'm not going to get that much ram or at that speed right away but for upgrading purposes it's sure is nice to know that is supported. My question is that if I go with a 64 bit vista, will I run into compatability issues? In other words will only 64 bit programs run? If that is the case maybe I will just stick with a 32 bit vista. Is there a huge difference in performance between 32bit and 64 bit anyway? I know that I asked a few questions in this post, but could someone help me out here? Thanks!