Exactly. When your current OC becomes unstable, you up the voltage a bit (one offset at a time) untill it is stable again. Also monitor your temps. When they get too hot, lower your frequencies or volts. Up to 1.55 volts for an oc that will last the majority of the chips normal lifetime, up to 1.45 for maximum lifetime of CPU (if you hardly upgrade), above 1.55 volts is a three year lifespan and very cooling sensitive.