I'm OCing a friend's system here, a new DS3 (rev 3.3 I think, it has the FSB1333 sticker on the box), F10 bios, a C2D E6300, and 4 of those SuperTalent DDR2-667 modules installed. Leaving all of the voltages at default (manual setting, not auto), and clocking the FSB to ~430Mhz, PCI-E to 100Mhz, DDR2 ratio at 2.0, C1E and EIST disabled, will boot, load Windows, and run Prime95 stable.
But pushing any futher than that, *regardless* of voltage increases, seems futile and leads to non-booting or boot loops. What's up with that? I've tried Vdimm +0.4v (2.2v), Vfsb +0.1v, Vcore @ 1.35v or 1.4v, but can't get 450Mhz FSB to boot, nevermind Prime95 testing. I can't imagine that this chip tops out at 3.01Ghz, nor that this mobo tops out at 430Mhz FSB, since Gary Key in the official thread talks about getting chips up to 500Mhz FSB. The only thing that I can think of is that the RAM won't run at 900Mhz, even at very relaxed timings (5-7-7-x, I think) and 2.2v. But would RAM cause non-booting scenarios? I would just think it would prevent booting into Windows, but no POST???