That's the one place you generally can't go wrong. If you ever lose the original paperback look you can look up the model you have for downloads at the manufacturer's support site.
On most boards simply leaving the voltage settings on auto will see the bios adjust voltages automatically for the memory used. On the board here the lowest is 1.8v with the memory able to run upto 1.95v where I can limit the voltage to the 1.8v setting or leave it on auto.
