What is the best fan design for power supplies?

Toomuchprotein

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Oct 1, 2014
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If I'm trying to decide between two power supplies that are otherwise exactly the same, should I go with the one with two 80mm fans (one on the top and one on the back) or should I go with the one with one 120mm ball-bearing fan on the top? Even if the difference would be miniscule, which would provide for the best cooling for either my power supply, or the ambient temperature inside my case?
 
Solution
Hi
If all the fans are running at the same RPM then the 120 mm will move more air than the two 80 mm,the 120 mm will also be quieter than the 80 mm ones.