Depends depends depends.
Does your motherboard allow the bios to be played with? If not, you most likely wont get an OC out of it.
Max frequency without overheating? Every chip is different, and will react differently to OC, even two of the exact same chip. It is the nature of CPUs. As a rough guess, if you can keep it stable, I imagine you could probably get 3.0 to 3.2ghz daily OC, but again, it will be your trial and error to figure it out.
Do some research into the max temps the chip can take, what other people have done with it, and how to OC in general.