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Turns out that my CPU fan requires a proprietary device to turn off the rgb in it, or adjust it at all.
I just assumed that if a motherboard had an RGB header you could control it from the BIOS, because that’s how it worked ten years ago. But no, these days you need their software, which crashes on install under windows and doesn’t support anything else.
If you are lucky OpenRGB might work.
Unless the fan has a separate battery back up (which would be very weird) then this should not matter if you enable ErP.
AFAIK enabling ErP will shut off power to all components when the computer is turned off. Good luck!