Well I use those exact voltages for my 4050 450FSB 24/7 stable in prime95, and 50 runs of linpack. I'm actually typing from it now, even. And I don't use bios or software for voltages, ever, DMM is your friend. The problem is CPU-Z.
Admittedly, I have QX9650, C0, But I can guarantee that you need some tweaking, or it's teh cpu, not the board, as this board has provided more FSB than any other I have tried so far, ever, for 45nm quad.
I can easily boot into 460FSB, but I have not done much work on stability yet(this is P05 bios):
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