Board is P55-US3L, BIOS is v.FH. I guess most of this will apply to other P55 boards.
Included in the Advanced Frequency Settings section of MIT, in the BIOS, are these settings:-
CPU Clock Drive (adjustable in steps from 700mV - 1V)
PCI EXpress Clock Drive (adjustable in steps from 700mV - 1V)
CPU Clock Skew (adjustable from 0 psec upwards)
How can one know the values to which to set these?
I've currently got the first two set at their default values. Initially, I had the clock skew set at zero but currently I've pushed it up to 50 psecs, thinking that otherwise jitter between the CPU and chipset clocks could result in iffy operation. But, without using an oscilloscope, I can't see how one can possibly know what the default timing relationship is between them, or indeed even know what the acceptable tolerance is.
Incidentally, my BIOS is suffering from the ubiquitous 'CPU core temperature bug'. I hope GGTS will soon find a better workaround for this than the one we're all having to use at present. I'm also getting strange random accesses to the FDD (empty) in this new PC, though the accesses stop after the PC's been on for some time. (And no, it's not that it's the first boot device in the BIOS menu). Seems to be mouse-related. And the HDD activity LED on my PC's casing is showing a very regular, constant access, even at idle. Never experienced that on any PC I've ever had before. Anyone else observing similar things on their P55 machine? I accept, of course, that these sorts of things can be due to features within certain applications, so may possibly have no cause in the board itself or in its BIOS.