I am running a Noctua 40mm 5v fan on top of my Raspberry PI. It cannot be heard, I've been tempting to under volt it 3v since it has been keeping my RPi4 at 50C

I am running a Noctua 40mm 5v fan on top of my Raspberry PI. It cannot be heard, I've been tempting to under volt it 3v since it has been keeping my RPi4 at 50C under load without heatsink.