I had the same troubles as you, with corrupted bios and not being able to post over 450fsb.
I used the AMI bios recovery method to bring my board back to life.
I thought the same as you more volts needed, but its not.
Changing the MCH GTL REF voltage from AUTO to 0.64xVTT got me over the 450fsb hurdle.
I am at 460fsb, occt 1hr stable after changing that setting, give it a try
NB/ SB voltage at 1.088 (+0.100v added to Chipset Voltage)
FSB voltage at 1.104 (+.0100v added to FSB Voltage)
Honestly mate, try it

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