Quote Originally Posted by halo112358
Meh, it ran for about 4 hours and then failed I guess I don't get the magic 75% OC after all I do get 3.0 stable with 1.575-1.60v.

I wonder if it was memory controller, northbridge or core that errored out ? My chip doesn't seem to like dividers other than ddr333 or ddr400, I tested with DDR300 and orthos fails at much lower OC's than with DDR333.
It is true that some MB's don't mesh well with lower dividers and the Opty's memory controller. Did you try running Orthos small FFT's? That stresses the CPU only and should help narrow down possibilites for the culprit.