@Viper & DiscoTech, and h/t to ElektroSadist, I did as Elektro suggested and just went into the BIOS and tried what he said. Here is what I did:
- go into BIOS
- set multi, FSB and mem strap & divider for what you want
- set *all* of the voltages to the same volts as default voltage shown to the left (not "Normal" or "Auto")
- then set vCore and DRAM voltage to what you want. notice that now some of the other settings under ">>>DRAM" heading are no longer at the default. This is good.
- set Vtt ("CPU Termination") to what you want. notice that now your CPU reference has changed and maybe some other settings as well
- set MCH Core -- same goes, maybe some of the other settings change to reflect your new MCH Core

F10 boot and open windows, ET6 just shows the default reference voltages for the ones you just saw in BIOS had changed automatically.

I don't know how Elektro knows that the BIOS is showing the correct voltages rather than ET6 but I think he knows more than I do.