Not sure, but as far as I've heard the K8T890 isn't X2 compatible. There could be some sort of firmware (chipset) updates that fix this though. Why don't you look at the AN8 instead of the AX8? AFAIK, it's the same price almost. AN8's $103 and I'm sure it's a better board/better overclocker than the AX8.
-The Pentium Guy