As for the OC attemps, I'm sorry you're having trouble. Right now it does seem that the board works better with Conroe and Kentsfield chips. I would not recommend you OC through the Windows utility -- they tend not to work well. As for OCing through the BIOS, are you sure you have all the necessary settings disabled? Make sure that EIST and Speed Spectrums are disabled in the Cell Menu. Then go into the chip features menu where the Execute Disable Bit feature resides, press F4, and make sure that C1E is disabled and that Thermal Management is disabled. Lastly, have you tried any of the beta bioses from
http://forum.msi.com.tw? The latest, 1.1B4, was released two days ago and people are finding some early success with it regarding the 45-nm chips. Before giving up, flashing to a newer BIOS is absolutely worth a try.
Good luck. Lastly, what's your PSU?