either for more overclocking headroom or a try at unlocking the cpu to 4 cores. by the way the mobo is Asus m4a785-m with the latest bios for those who don't know.
That is the exact motherboard I have. I have never gotten the message "overvolting failed." Are you sure it didn't say "overclocking failed"? I don't overvolt though so I might be wrong in my assumption. Anyway.
What manual voltage settings have you tried? Are you doing this on stock or overclocking the CPU at the same time?