Abit KN9S - I'm not trying to be funny, but I've just built (6 days ago)my first A64 PC based on this m/board with a x2 3600 brisbane and 2GB of Crucial Ballistic DDR2 667 and a decent Seasonic 430W PSU. Everyting is at stock speed right now.
I would have preferred to have used the KN9 Ultra as reviwed at http://www.phoronix.com
, but they are scarce in UK and are relatively expensive.
I updated to the latest BIOS before loading/running any os and so far have not hit any stability problems. I've run memtest and orthos without errors ...
I'm sorry you've hit problems. Could they be memory based?