I tried the new beta which is supposed to contain the fix for the 20% fan speed bug. However, with the R9 Fury this issue is not resolved. The fan is stuck at 20% which for some reason on the R9 Fury is lower than the minimum voltage threshold resulting in the fans for the Sapphire Tri-x not spinning.
I tested in game and with benchmark software, the card heats up to over 80C and the fans never spin and Crimson says they are at 20%. Furthermore, 3rd party applications such as Afterburner cannot override the 20% fan speed via custom fan profiles.
The only way to resolve the issue is to revert to 15.7.1 or 15.10 beta.
I filed a bug report on amd.com/report
Hopefully this is looked into as the R9 Fury seems to have a different internal fan controller compared to the 300 series and older gpus.