If the CPU temperature gets above about 45 C the fan starts. You might want to save a copy of the unpatched blob just in case. On Fedora a arch64 running on an RPI4 this is at /boot/dtb/broadcom.
It's the vortexes that create the noise so lower speed and smaller vortexes makes the fan a lot quieter. Finally, upload the blob file to the appropriate file system location on the RPi4. The nine blades meant it could run a little slower to shift the same amount of air and the notches break up the vortexes at the trailing edge of the fan blade where the high-density and low density air recombines. I think you can get PSUs with fans that are controllable (or at least have their own control) but that is on a high end PSU rather than the sort of bog standard PSU that you get in a case.Īs an aside I recently saw a new CPU cooling fan design with 9 rather than the standard 7 blades and with notches in the blades. Some "gaming" cases come with a fan (or a place for one) that is the full width of the case ~240mm. Most modern motherboards have an option for a case fan and so do most cases, often a 120mm fan which can shift the same amount of air as a standard 70mm fan at a much lower speed (and therefore less noisily).
The second fan you are getting a zero speed for is the case fan (which you haven't got installed).
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