I have been trying repeatedly but I cannot get my M2F to do 542 FSB / 650 MHz SPI32M stable. It locks up or errors out before it's even completed the initial value. My P5Q-Deluxe has no problem at all doing this. The P5Q-D also needs no ram channel delay to stay stable at for example 534 FSB / 640 MHz, whereas the M2F needs 150ps delay on the channels or it will hard lock with over 2.2 vdimm. What I find a bit odd is the fact the M2F is stable at 534 FSB / 650 MHz at reasonable voltages, then is completely unstable only a little higher regardless of the voltages I give it.
I don't know if it's bios differences that are responsible for the different behaviour between the 2 boards as hardware wise they are very similar, they both run the same vNB/vdimm/timings/PL etc up to 534 FSB / 640 MHz (except the M2F needing the ram delay) but after that the M2F stops and the P5Q-D keeps going. The M2F is however slightly faster than the P5Q-D clock for clock at any given setting.
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