This is my results with the bugged Ram multiplier 1/3 that with auto settings doesn't arrive over 490FSB.
With P06 bios
I modified Dimm2/Dimm4 clock skew adjusts from auto to -3 (-2 or -3 for different FSB) and dimm2/dimm4 ctrl skew from auto to -2

500fsb



505fsb



510fsb (not stable)