i have a soyo sy-7vca mb and a celeron 600 flip-chip. i have it clocked to 747mhz (9*83) and it's rock solid. when i try to bump the fsb to 85 or higher it immediately locks up... i read that soyo boards used to have jumpers to set fsb range, ie. 66-83, 85-115, 117-140, but the fsb should be able to be set from 66-150 through bios setup. there are jumpers near the socket that show how to set for cyrix III or Intel, but i can't find any documentation on this. any suggestions??? i don't really see a 18mhz core difference causing the problem... any suggestions will be greatly appreciated. thanks. seahawk.