Well, since you have it OCed to 3.9, you can probably take it back to its stock setting for now and then work on checking to make sure your cooling is adequate. If you want to keep it where it is, maybe look at a different cooling solution if the fan you have isn't cutting it. I'm not saying all OC builds use liquid cooling, but enough of them do that it might be worth looking in to for you (if it would fit your case etc).