The current Wattman for the R9 390 is missing target settings as well as temperature controls (you can only set it to auto or adjust fanspeed to one speed constantly). The new Crimson also disables 3rd party software from doing it. This is unacceptable.
i have the R9 390X and i have the same problem i used to use msi afterburner but it also started screwing up and now can let anyone else use my pc because wattman is so unresponsive at times. I would set fan speed to something and my gpu fans would just do nothing. sometimes i try a few minutes later and it will work and sometimes not at all??????