you might be able to go to 3.0ghz but i wouldnt go further then 2.8 especially with the stock heat sink, when u run it all your cores on 100% how many minuites did you run it for, if it can run for 30 minuites in the 60c zone then this is okay, i run mine oced at 3.6 and gete 60c oc and 30 idle