To overclock today, we used the dedicated overclocking tools within the latest version of AMD’s Catalyst Control Center.
There is only a little headroom available on the Asus R9 290X Direct CU II, and we found that increasing the power limit settings beyond 10% didn't reap any reward. Our final result was 5% above the out of the box overclock settings, from 1,050mhz to 1,103mhz. The memory is configured very close to the limit.