Theres a couple of 'Extreme Overclocking' articles out there, but they involve modding the card; look through the IXBT-Labs KYROII reviews to to that. The easiest way of overclocking KYROII without mods is to open the windows registry and searc for CorePLLFreq2, up the value next to that and reboot - most people can squeeze about an extra 10Mhz out of it, some up to 20 or 25.
The leaked Beta's that are floating about have an overclocking slider on them which doesn't require a reboot when used.