The maximum overclock on our sample card was 1200 MHz for the GPU (14% over reference) and 1500 MHz memory (7% overclock). GPU overclock is average, in line with what we saw with earlier HD 7870  GHz Edition cards, but the memory did not want to follow as after 1500MHz. We used default fan and voltage settings as defined in the VGA BIOS. However, a quick test of Sleeping Dogs showed that overclocking yielded a 10-percent performance boost.