Custom fan speed curve applies only to 1 fan on Gigabyte Gaming OC RTX 3080 card
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Pivoo commented
All RTX 3080 have 3 fans, I don't know how other companies 3080 cards have it set up in BIOS, but from what i see, the Gigabyte Gaming OC 3080 has 2 fan speed sliders in the NVIDIA X Server Settings (Thermal Settings).
Normally it looks like this:
http://2.bp.blogspot.com/-TXEz3Gpyqk0/VUtEZ1nxS1I/AAAAAAAANNw/DRldQLj1V5w/s1600/thermal-settings-fanspeed.jpg
For the mentioned card, There are 2 fan speeds:
Fan 0 Speed
Fan 1 Speed
The custom curve applies only to Fan 1 Speed, which results in only 1 fan of 3 spinning. I guess Fan 0 Speed is setting the speed of remaining 2 fans. Custom curve should apply to both Fan Speeds.