this is Fanless PSU. Certainly, there is no fan, but that does not mean it is completely silent. I have learned to my cost. certain electronic components (confirmed by Seasonic on this model on a power supply test site) can produce what is called an "electronic noise" in general an ultra acute noise, almost inaudible to most people, but nevertheless well now. Suffering from auditory hypersensitivity, the consequences were immediate: as soon as I turned on the power, BOOM .... abominable sore heads and traumatized ears. had no choice but to turn it off and return it. So attention to hypersensitive ears, this PSU is to flee, despite his "fanless / silent" For the rest against this should pose no problem.