HT mentioned this online, but I just now got around to trying it...for my PIII 800, instead of using a pre-set "800(133)".. I changed the multiplier to manual in the bios, using 124 with multiplier of 6.0 (744) and I went all week-end with no lockups, even with SBLIVE panel, and others back ground apps on.
Thks Hitech.