After a night of testing, I managed to o/c my PC to 475 1:1 at these settings:

Code:
cpu multiplier: 7

timings: 5-5-5-15-5 35 5-11-7-13

cpu voltage: 1.55
ram voltage: 2.35 (required for hyperx 9600)
fsb termination voltage: 1.45
nb voltage: 1.65
sb voltage: 1.7
ich voltage: 1.02
If I go any higher, to 500 or 490, the PC POSTs but vista crashes. Upping cpu voltages (up to 1.65) allows for reaching the login page but the PC hangs at that point.

Could this be due to an underpowered PSU? I'm trying to find out if I should upgrade my 500w Liberty.