ASUS boards default to allowing up to 0.30 volts above default for any processor. If you wanted to get 1.90 or 1.95 volts, get a cC0 stepping processor, which defaults at 1.70 volts.
You can also try to get the latest BIOS....in one of the revisions they increased the maximum voltage. The latest BIOS for the P3B-F is version 1008 Beta 001.