they do not make dual cpu motherboards for the AMD XP ( as far as i know). You would have to go with the AMD MP. Which are not bad. But another option to look at would be the Opteron. If money is a factor, you could consider getting a dual opteron board and when prices come down or you save up the money get the second CPU. I do not know enough about the MP series, im not even sure they are 64 bit compatible. But i hear that the amd 64 will have an amd 4000 out by 3rd quarter and they are not planing on changing the socket anytime soon. Either are good setups, just depends on what you plan on doing with them as to your needs.