for some reason both Z68 and Z77 undercock the BCLK slightly, perhaps it's related to some spread spectrums that are turned on by default and not an option to change in BIOS?
usually changing BCLK clock in BIOS from 10000 to 10033 (actual 100.33MHz) or 10025 value in BIOS fixes it.
minimal bump in VCCSA might be needed to calm the stability issues. that's what I did on Z68 when trying to hit the 5000MHz mark.
Delirious, the old VTT/QPI is now the VCCSA (for all I/O devices) and VCCIO (for memory controller).
old FSB is now called BCLK. leave other voltages stock, I never had to touch anything else, generally the whole overclocking is done by increasing multiplier and vcore, at some point vccio may need a bump especially if combined with fast running memory and 4 slots occupied. bump vccsa only at higher clocks or when upping the bclk.
<message edited by feniks on Wednesday, June 13, 2012 9:07 AM>