Is it safe to OC while using Onboard graphics?

Hi guys-

I couldn't find an answer for this anywhere else, so how safe is it to overclock while using onboard graphics? I have an i5 4670K, ASRock Z87 Extreme3 mobo, and cooler master hyper 212+. I'll be getting a 770 once I can afford it, but until then, how safe is it to OC?

Here is my entire build, and the parts that aren't marked as purchased yet aren't purchased yet.
http://pcpartpicker.com/user/SynchHD/saved/3wLv