For instance, take the MSI Hawk version GPUs or the EVGA Supercloked version GPUs.. They've already been overclocked from the reference speeds.. If 900 MHz has been overclocked to 1100 MHz or more, can I overclock it further by using MSI Afterburner, etc programs? If so, giving more cooling to the cards as they overclocked, what will be the limit? Where to stop?