Using the Overdrive utility, it was particularly easy to get an extra 91 MHz out of the core and 129MHz out of the memory, but that wasn't nearly as good as some of the overclocks I've heard of, so manually I cranked it up to a stable 770MHz on the core, the maximum allowed by the current BIOS, and up to 1040MHz on the memory--a nice 21% overall overclock.

Source: The Tech Lounge