This is entirely conjecture, but are you sure there isn't another setting that's borking your OC right now? That's some pretty serious Vcore, even most 65nm Quads (the newer steppings, anyway) can be made rock-solid at 3.6 with no more than 1.450.
__________________ QX9650 @ 4.038GHz (425x9.5) | Asus Formula Maximus | GTX280 (777/1620/1404) | Mushkin XP2-8000 Redline 2x2GB
Q6600 @ 3.6GHz (400x9) | MSI P35 Platinum | 8800GTS 640MB (700/900) | Mushkin EM2-6400 2x2GB
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