All of this is thermally limited. If your cooling system can pull the heat away fast enough, for some period of time the chip will go up to 5GHz on two cores.

All of this is thermally limited. If your cooling system can pull the heat away fast enough, for some period of time the chip will go up to 5GHz on two cores. It's quite likely that a normal air-moving fan + heatpipe radiator will not let you do this for more than a few minutes.