Want to o/c my Celeron to 560 (70 * 8), and I need to know what kind of voltage I should use. I have a 300W power supply, if it helps. I also have sufficient cooling in my case (coolermaster or something like that). Although, I haven't researched exactly what coolermaster is so it could be whatever inside my case (it was custom built, but not by me).

Any suggestions?