On the Quad side of things:

I've been fighting with a Q6600, 4GB Corsair XMS PC6400C4, and at first a P5B Dlx and now a P5N32-E. I've run the memory at DDR2-900 for hours in Memtest, no problem. I couldn't get either board P95 stable over 320mhz though. I don't know if it's in the proc or what, but I'm going nuts. The other problem is I've gotta use 64-bit Windows for this customer, and I think opening up the extra registers lowers my clocking.

I'm going to go back over this thread when I get back to work on it later, and see if I can make any headway. I'd love to see a 400+ FSB and 3.2ghz, that's what I've wanted all along for this customer. It's a pain when I've almost got my e6300 100% OC'd, and I can't budge this Q6600