If I had an Opteron 144, a strong 20-pin PSU, and limited budget, I'd give the new Asrock 939SLI32 mobo a try. Preliminary reports indicate it's a great overclocker, has decent performance, and has a couple more features (SLI, gigabit LAN, 1394, etc) than the Asrock ULi 1695 (Dual SATAII)...