Can't undervolt with my mobo? why? asus m3a78-em

[expxe]

i have a asus m3a78-em motherboard and i was looking thru the bios and there doesn't seem to be any options to undervolt my CPU. the cpu voltage select has auto/+50mv/+100mv etc(not exact values, i can't recall, but you get the idea). so where is the option for me to select a LOWER voltage? does anyone have experience with this motherboard know the answer?

 

[roonj]

Alot of boards don't allow undervolting, this is an option which was ignored or overlooked by manufacturers. Some boards do have the option.
I shouldn't have said don't allow, it's more like didn't anticpate. They could later make it available through a bios change if all the equipment for voltage regulation is present on the board.
It seems that some manufactures opt for pick a voltage and others opt for add to the voltage.

 

[expxe]

i was able to undervolt using amd's overdrive software. works great