03-02-2014, 10:58 PM
I may be wrong but I think Bonaire is an OD6 card? Perhaps it has the weird Powertune that throttles in favor of low noise just like R9 290X. Upcoming oHC v1.02 might behave a lot better but until then I suggest you try https://github.com/epixoip/od6config and see if it helps.