The voltage is kinda high for that overclock. Not dangerously, but you could do better by just doing a manual OC. That would lower the temps, too. Your temps are fine, but at that voltage, 4.7 should be within the realm of possibility. Possibly not, as well, but most I've seen can do 4.7 at 1.4V or a little less.
Basically, just read up on manual overclocking and try that. I personally use adaptive voltage for my OC on my 6600K, but you could also do offset to achieve roughly the same results. Meaning volts and speed will actually drop at idle, which is really what you want.
Thanks, But my question is if it is hurting my cpu?