Yes, it supports OC'ing. The problem is that it is not best suited to do so. The VRMs (power transistors) have no heat sinks to dissipate excess heat caused by OC'ing. The board's phase power is limited, and the components used are not designed for serious OC'ing. That said, you can do a little experimenting if you like. Asus makes good boards. But the Phenom II X4 840 has a locked multiplier, which means you will have to get all your freq. increase via the base clock. That has a drawback of being limited to only a few hundred MHz, along with having everything else that runs off the base clock increase as well.