It comes with AMD drivers. IIRC, you go to AMD Settings | Gaming | Global Settings.

Anyway, I hate those fancy messy gamer apps. WattTool is much faster and easier.

http://www.overclock.net/t/1609782/watttool-a-simple-tool-that-combines-overclocking-with-vrm-monitoring-tweaking-for-rx-400-series

Regards, Brusque