I need some help controlling the CPU cooling fan speed on my Dell Optiplex 7050 Micro.

Basically the fan is always running, at a high RPM, much higher than it actually needs. As a result it's just too noisy to work on.

The manual says there is an option in the BIOS under "Power Management-> Fan Control Override" but my BIOS doesn't have display that option.

I've tried cleaning the thermal paste and applying a new coat but it didn't make any noticeable difference.

It would be great if I could set my own fan curve. I've tried installing a Fan Control application in windows but it doesn't detect the fan sadly.

Is there something else I can try?