Try installing Speedfan. It'll change the fan speed in response to how hot the PC is running.
Also ultra quiet replacement fans aren't particularly expensive.
It only seems to recognise the CPU fan for some reason.
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Only the ones plugged into the board pins will show up so anything plugged straight into the power supply will just be on full blast all the time with no sensor use.
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Try installing Speedfan. It'll change the fan speed in response to how hot the PC is running.
Also ultra quiet replacement fans aren't particularly expensive.