One thing about that DFI, it doesn't say it supports X2 processors. However, a reviewer says he has an X2 running on it. Should I be ok with an X2 3800? Thanks for your help.
You will be fine, it runs the exact same chipset as the Asus board. None of the Asus's boards on newegg say they support Opteron CPUs but Asus will tell you they all do for example. Anyway, all the boards support X2 per DFI's site.