Version 3.0c. Fan control seems not to be working properly.
Environment:
Clean installation Windows 10 (1709), no updates.
Drivers - latest (18.6.1)
Card: single Asus ROG Strix RX580 O8G (stock bios, only timings modified)
No any additional software than can interfere with fan control is installed (like Afterburner etc.)
-fanmin 50
-fanmax 100
-tt 55
When miner starts - fans are initially stopped. When temperature rises to 50 and above - fans start working on max speed (maybe not max but high enough). In a few seconds temperature drops below 50 and fans begin to slowdown and finally stop. In a few seconds the sequence repeats.
Tried setting -tt -50 to force constant fan speed - not working.
Your card starts fans at 50'C because it is programmed in bios. Same cards have that.
-tt 55 means target temp. 55'C
If your fans starts at 50'C and target is 55'C, so you are very close to your target temperature, that is why fans are working close to 100%.
Change -tt 65 and you should be fine.