For a moderate OC like that, you don't need a super high end board. I am currently testing the Gigabyte ga-z68ma-d2h-b3 and hitting 4.3 or so is as simple as hitting the "Turbo" button. But you will run into heat issues with the onboard components if you try to push the voltage to the CPU's limit to reach higher clock speeds. For the explanation as to why, wait for the review