I tried everything guys.. 150 to 90, no go. It worked with 1,4V VTT and GTL ref to 68/67% on the IX38 all the way to FSB 480. And I know you can hit 500+ easily on a dual, I was priming my E6600 on a P965 at >500 years ago on a 1066 strap like everyone else, no big deal.
But it really seems the X38 doesn't like my Quad. Hell, I've seen people go back to the P35 because they said it clocks better...