XtremeComputing has posted a review on the Silverstone Strider 560W Continuous PSU
A single 120mm fan should be more than enough to cool this PSU with 80% efficiency. When you think about it, that means that at maximum load this PSU could be dissipating over 100W. I cringe to think of some power-supplies which only have 60% efficiency - they would be a bigger source of heat than any other single component in a PC!Silverstone Strider 560W Continuous PSU Review