I use Mercier's indispensable "FanControl" utility to control case and GPU fans. If you don't know about this app, check it out. Free and phenomenal.
But it relies on Libre Hardware Monitor sensing, which apparently has limited compatibility with Radeon GPUs because... guessing that AMD doesn't provide any help to those devs.
I want to replace my old NVidia 1080ti with a new Radeon, but CAN'T if FanControl doesn't work with it.
So I ask AMD to get together with the Libre project and make sure your cards are as well-supported as awful team green's.