hmm lets see, its been awhile since i have had that cpu in my box...
well, the HTT was 250 with multi at 11.
the HT multi was at x4.
the ram was probably set to ddr2 667 in bios, maybe ddr2 533 for stability testing.
i know my vcore wasnt over 1.45, i had to run it at 1.525 to reach 2.9 though (and boot at least). you are probably right about having to up the voltage.
i have a zalman 9500.