Seasonic and SilverStone Fanless PSUs
 

Both power supplies I’ve tested today are good. Indeed, I have got not a single serious complaint about the SilverStone Nightjar SST-ST45NF or the Seasonic X-400 Fanless SS-400FL. Both are going to be a good choice for building a quiet home computer.

Between the two, the Seasonic is the better option. It represents the company’s new platform that features nearly all economically justifiable technologies and solutions available today. This platform proves to be suitable for designing fanless PSUs as well. By achieving high efficiency and placing hot components apart from each other on the PCB, the developer made heavy and bulky heatsinks unnecessary while cooling the PSU through convection only.

http://www.xbitlabs.com/articles/cas...e-fanless.html