I made some measurements:

Set in BIOS <-> showed in BIOS <-> measure point from hicookie

1.250 V - 1.24 V - 1,006 V
1.300 V - 1.29 V - 1,084 V
1.350 V - 1.35 V - 1,072 V (!)
AutoVC - 1,37 V - 1,110 V
1.400 V - 1,39 V - 1,155 V
1.450 V - 1.44 V - 1,172 V
1.500 V - 1.48 V - 1,201 V

BIOS: 1.03
Mods: no