I've actually tried the 312x8=2.5, w/ a mem divider of 3:2, but in that case it doesn't even POST, hangs in the BIOS. I haven't tried a 9x multiplier because my MB doens't support any other dividers aside from 5:4, 3:2, and I can't get my memory past 220 with 2.9v.
Is it strange that at 250...