Fortron Sparkle ZEN
 

Today we have a very special PSU on the test bench - it is completely passive. Fortron trusts their design so much that they say a backup fan is not needed.
I was surprised to see the Fortron Sparkle ZEN power our demanding test platform without any load problems. While the electrical noises were definitely annoying, they are only noticable on higher power systems.

Link (english):
http://www.techpowerup.com/reviews/FSP/Zen