The Seasonic PRIME 600 Titanium Fanless PSU has a feature that many find desireable, and as you might have guessed it, that is silence. High efficiency and noise-less performance go hand in hand, but those qualities do not come cheap, however if you are willing to spend, you can own a high end PSU that will never offend your ears.

Source: [H]ardOCP – Seasonic PRIME 600 Titanium Fanless PSU Review