OC on a ASRock Z77 Extreme4 Motherboard

im building a new rig and im wondering  how high of a overclock do you think of an overclock i will be able to get with a h80i on a ASRock Z77 Extreme4 Motherboard with a i7 3770k?

If I had your setup i would shoot for 4.7/4.8. That board isn't terrible, but it's not a top end msi or asus board so you may or may not get stable at lower voltages.

This graph is useful for minimum voltages.