After a week with my new build I'm realizing that my fan curve settings are terrible. Bottom PWM fans are mapped to coolant temp, basically linear from 50% duty cycle @ 30 Celsius coolant to 100% duty ...

So I built out a new box some months ago with the help of the fine Ars folks and it's been running great until recently.. for some reason the fans seem to randomly ramp up high for a few seconds then ...