Can't adjust voltage to my CPU

Markxy10

Distinguished
Nov 1, 2009
10
0
18,510
I am new to overclocking and all, and I need help with 1 thing, I got MSI K9N SLI v2 and a AMD Phenom x3 8650. When i go to bios and frequency/voltage adjustments. Then I can adjust the frequency of my CPU memory bus, which is 200 by default, but i can't adjust the voltage, when i try to select it, it goes over. It says [auto] and in gray font.
P.S My voltage is 1.264 v and memory bus multiplier is 11.5 just in case you need the information