New PC should be OC'd to 4.4Ghz but when Prime95 is running the highest I've seen it go is 3.4Ghz
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Must have forgot to overclock it i suppose , call PCS they will guide you through the overclock process , presume its an ASUS board , with this just set it to performance mode in the bios & it will overclock it automatically & safely. you did select an appropriate cooler ? if not then this could be the reason for no overclock