hi Ivan, there is actually a workable method to this buggy Asus BIOS madness but to do manual Vcore needs a little workaround and experimenting.

In the BIOS, reload defaults and set VDimm as required per your RAM (avoiding the other P5B bugbear, too low VDimm causing no POST). Check the Vcore setting to see if it allows manual settings, if not leave it at Auto for now and save settings to do a warm (re)POST. Enter BIOS again, this time the Vcore should now be adjustable so enter your desired Vcore and other settings but do not reboot yet. You will need to save your settings to 1 of the 2 User CMOS Save Settings Banks while the Vcore is adjustable. This will maintain the Vcore settings at non-Auto but note that it does NOT save the multiplier setting at all so each time you reload the CMOS setting, remember to check on the multiplier as well. From henceforth, each time you need to adjust and save any BIOS settings, reload the saved bank settings 1st and adjust from there so the Vcore is always adjustable.

Note that altho the Vcore is now adjusted to your desire and can be confirmed via the HW Monitoring section of the BIOS, the BIOS Vcore screen itself does not reflect this and will again misreport it as Auto only. Not only is it mis-reported, you also can't adjust any setting in the BIOS when this happens cos again the BIOS will revert to Auto, auto-scale too high. Thus, always adjust settings only after reloading from your saved CMOS bank.

Quite a mouthful there but do experiment around the BIOS and you should be able to work around Asus BIOS bugs till they get around to fixiing it, if ever.

HTH.