I'm in the dark here since trying 500x8.5 on my UD3P ver.1.1 with Q9550 and pair of OCZ Reaper PC29200 4gb kit with no luck. Prime95 hangs wtihin 5 approx. 5 minutes. But below 500x8.5, those combo works like a charm.

Here's my dailiy highest clock, 495x8.5, Prime95 stable (sorry for the tiny screenshoot)



What should I do for the reach of 500x8.5 up?