Does anyone know of any ffmpeg setting(s) that'll limit it in such a way as to drastically reduce the fan noise while encoding video?

Because this machine is a fucking jet engine while encoding, and I don't mind running it longer (maybe even overnight) if that means it'll be quiet for a change.

Edit: Solved. Windows 11 Power Options/Advanced Settings/Processor power management/Maximum processor state from 100% to 50%, whisper quiet now.
Thanks @jnnnn!

_{Yes, it's not an ffmpeg setting, but it's arguably better to do it at this level for the whole thing, so you can throttle up or down as needed}