I saw your photos, but both show the temperature around the same which would mean the fans would be running at the same rpms. You should show the fan's RPM when the temperature is in the 30's C and another with the fan's RPM when the temperature is in the 50's or above C.
From other posts in the past, 3rd party OC software interferes with Wattman causing computer issues.
i installed and tried wattman first, of course, as it comes with the driver software. before either of the third party software.
updated the screenshot link with two new screenshots with temp at 59C, thats as high as im willing to push it.
I tried downloading Powercolor OC software. I got a .exe file of 43 bytes. lol
This a copy from the Powercolor link you gave. It shows the cards that are supported. None for your card.
Product Support list
Have you tried Asus Tweak II. It's not very popular and seems to cause problems on some computers. just a thought.
Found this previous thread here in AMD Forum concerning fan control by wattman. Its about a year old but it may still be of some help. Fan speed problem after new driver r9 390 (Kingfish gives some good advice about fan control using Wattman)
thank you for the suggestion, hopefull, i just tried Asus Tweak II and unfortunately like the other programs it would allow me to change and apply settings but had no actual effect on the fan speeds.
im thinking my last resort is gonna be to just buy a physical fan controller like maybe this one https://pcpartpicker.com/product/jJvRsY/lamptron-fan-controller-fcfc2b
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Start with this (applies to the 390(a couple of other models ?)),
So it won't have all wattman features(as some other card models). The fan control is a fixed speed setting(which does not work correctly with the Vbios controller ?).
Leave it on Auto. My 390 G1 works fine on the Vbios controller.
59C is nothing to a 390(most models run on low fan idle up to 60), 72-85C under heavy load is average norm. 93-94 is where it will slowdown/shutdown to save itself.
I saw the images as well and I think you might be missing some temperature and fan settings.
These are the settings available to me Imgur: The most awesome images on the Internet
Currently on the 17.7.2 driver and using a XFX RX 480 RS 8GB, I'm not sure whether or not if the GPU manufacturer has anything to do with it.