^That is a very good OC, remember that the safe voltage for your CPU is 1.425V. [bSee specifications here
i've seen in reviews upto 1.52v on this cpu, which seemed kinda high to me. to be honest i set the voltage to 1.425 didnt even check if i could run at one step lower than that at 1.4v. But 1.425 should be safe for running 24/7 right. and i will not be using that overclock all the time anyways i dont think. just when gaming.