I just found out that most pwm noctua fans (maybe other brands too) can go down to 0 rpm. The quick specs are usually something like min 300 max 1500 rpm, but under performance specifications there's a Rotational speed @ 0% PWM. My cpu fan header in the bios doesn't allow less than 20%, but the chassis fans can all be set to 0%. I couldn't get my temps where I wanted with the fans cutting off, but it did work.

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