So I've started OCing my Opty 170. So far, 2.5GHz is not Prime95 stable but I've never given much of a care about Prime after it whined about my last CPU (2.2GHz->2.4GHz) which NEVER caused an issue in anything I did at OCed speeds. 2.6GHz is logically not Primable either but it runs Doom3 and I'm going to test 3DMark05. More info as I go.