i used "auto" volts and had cool n quiet disabled in bios.
on my dfi board, in the bios i then used the "spec" vcore control to get it to what i needed for my overclock. in my case it was auto + 10%.
if you were running stock, just set it in the bios to "auto" and then use rm clock to control the vcore when it drops to idle. when its under load, it will run the default vcore of your chip.