Yeah, I think why I did so well with my q9450 was my P5Q Deluxe mobo. I sold the combo to a friend who's an oc newb, and I walked the cpu up to 3.2ghz with all settings on auto. To go to 3.6 just required a bit more nb, and setting the gtls. From what I've seen, the 750i mobos don't do well with quads. I think you just need to find a decent p45 mobo.