I say they are both good quality and stable boards. You really can't go wrong with either. Both offer a nice amount of BIOS options if you choose to overclock although without water cooling for these 64's I don't know how far you'd get it. The MSI board I believe has 8 channel audio compared to ABit's has 7.1 Channel, but are you really going to have an 8 channel setup anyway? The MSI has dual onboard LAN, but once again it's not likely that you'll need that feature. I always suggest both of those boards anytime anyone asks for a socket 939 board so really I don't think you can go wrong with either.