This an answer I got from Noctua who make really quiet fans: You could give the NF-A4x20 PWM a try, however, it is much weaker than the fan shown on your photo. The device might actually need the additional power the original fan provides. It could also be that the device is checking the fan-speed during boot, claiming a fan error if the speed does not reach a certain level. We have also seen cases where devices checked if the power draw is within a certain range to determine if the fan is faulty, although I find it unlikely to see such a mechanism here. https://noctua.at/en/nf-a4x20-pwm
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