This is a 480W PC power supply, fanless (no ventilos)
So it does not sound, 0db. A wonder!
But beware: nothing is lost, nothing is created (in terms of energy, at least)
so that the power supply heats a lot, which is normal but has the disadvantage
raise the overall temperature of your turn.
We must therefore ensure that they have a cooling system as efficient and quiet as possible.
(For my part, I have two 8cm ventilos Pabst and a Zalman CNPS 7000B-Cu for the processor. Ventilos Tour closed and minimum speed that is not enough: the temperatures are limits fairly quickly. That way I liked to do half to leave the tower open, I made a mounting sleeve of food that I screwed up in behind what separates power completely from the interior of the tower. Now it's perfect.)
Before, I had an Airbus, now I have a glider.
For value for money: the power supply is not given (200 euros anyway!)
but the quality and silence are waiting for you.