has any tried crossfire X with more than 2 of these? I would like to pick up 4 of them if there haven't been any issues. The AMD forums have alot of posts about people not being able to get crossfire to work. I really dont wanna get [2x] 3870 X2's because people say that all only 1 core from each is working which is a waste of money. I would really like to build a spider platform so that I wont have to worry about upgrading again for a while.