What kind of performance could you expect out of 2x 3870's in Windows? I just got my 8-core 2.8 (only 2 gigs ram though for now), but just have the stock video. I've got games ranging from old school (Jedi Knight 2) to Age of Empires 3, FEAR, Far Cry, etc. I am not necessarily worried about running MAX settings at an ultra high resolution, but I my stock card will likely choke bigtime on some of these games.