^Do yourself a favor and don't run Prime
Rather, bench the setting and then start using it daily, i.e. games or whatever usage you want, but make sure to leave it on.

If its unstable, sooner or later within 10-20 hours it'll fail by freezing or crashing. Freezing will show instabilty and throws teh power draw up, back down MHz or increase volts, then test again. Freezing occurs when screen motion freezes apart from mouse movement which only freezes after a while of fast movement and clicking. I'm widely acknowledged expert in this last Phenom phenomena

Then, if you do manage to find something that runs smooth without error, first try rebooting a few cycles to see it loads faultless each time and if that passes, finally -> P95 test it.

Keep things constant each time, only moving one parameter. You will need to test a alot.

I've tried all the methods, this one worked best for Phenom. It'll save you much PITA and wife pillow beating