Caporegime
I can verify that the power limit/ power tune option is now working. I tested at +100mV and 1180 core with +50% power limit and the OC was perfectly stable with zero throttling. When I dropped power limit to 0% the core clock throttled to ~950.
So if you are still not getting power limit to work try clearing the drivers with DDU.
Powerlimit working in crossfire as well.