The 7900 series of cards, particularly the lower end 7900's, have built a sturdy reputation for being good overclockers, so we expected plenty of headroom with the 7950GT. From the default clocks of 550/700 on the Core and RAM, I achieved an overclock of 604 or +54MHz on the core, and 816 or +116MHz on the RAM - not the biggest I've seen for the 7900 series but still impressive.