For overclocking today we relied on Catalyst Control Center.
Considering the card is supplied in such a high clock state out of the box, the final overclock speeds are healthy. We managed to push the core to 1,160mhz and the memory to 1,500mhz (6Gbps effective).
The final score of 9,295 points is not to be underestimated. At these clock speeds, the card actually matches the GTX590 at reference clocks.