^ so very minimal OC if not K suffix cpu. If you want to OC get the K chips.
There's nothing wrong with overclocking a non-K CPU. Especially with cheap Z75/Z77 boards approaching the price of H77/B75 boards. You get a bit more performance for maybe another $5-10. If you want more, of course you'll have to get the K edition, as well as a better cooler and ideally a better motherboard as well.