Yeah i know, friggen XS having to be remodeled! Who the hell dot hey think they are, taking that away from us! I'm kinda excited to see what it's going to look like though...
BigToe over at XS, the one who does the majority of BIOS modding, has alot for a 939 chip. But i think you're right, because I remember reading an article that told of how to unlock the multiplier (down anyway) on the 64's and it involved taking off the IHS and bridging two transistors. I really wouldnt want to attempt that, at this time anyway...