I wouldn't mess with your multiplier as of now, that seems to have consequences of it's own. Before you sort that out I'd just reccomend boosting your FSB. Isn't your default multiplier supposed to be 10.5? If so, set it back down to that. Just overclock your FSB - you'll get better gains. Once you reach your overclocking limit while boosting only the FSB, this is the time to up the voltage. And damn, I just noticed that your default voltage is 1.65V. That is insane, my P4 won't boot with a Vcore over 1.6V, and it's default is 1.525V But, anyway, by upping it I mean raise it in small increments, 1.675V or even 1.7V for now, then overclock more. Not 1.8V right off the bat, even though your CPU and heatsink should (better) be able to handle it and give you better gains.