Not sure if this is a Precision issue but my GPU (GeForce GTX 1660 SC Ultra) doesn't seem to be accepting the fan curve. I hit Apply and Save on Aggressive/Quiet/Stealth,  but the fan just spins up to full power and down to 50% load all the time.  See screenshot.  GPU Fan1 Speed shows somewhat constant % but the GPU 1 Tacho shows the GPU Fan going up/down and temps seem pretty stable. As far as I know, I don't have any other fan controlling software installed. Any ideas?
 
Precision 1.1.7
Geforce drivers: 461.40
This is in a system running Unraid and passing through the GPU to a Win10 VM
 
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Thanks @cancerrat. I made sure the fan curve control was enabled.
 
I think I might have solved this by increasing the airflow in my computer case - added an extra exhaust fan and adjusted the exhaust fan curve in my bios to blow more air through.  I confirmed that the GPU Fan control was working by manually turning it off/on in Precision. Then I opened the case and the weird full-RPM cycling stopped so I think there wasn't enough cooler air flowing through the case.
 
My hunch is that the GPU has some sort of fail-safe either by some other temperature sensor I can't see or maybe an algorithm that determines if the fan speed isn't bringing down the temperature as much as it should be.
 
Feature request for EVGA/Nvidia - somewhere expose when something else takes over fan control...