The ONE situation where a fanless PSU MIGHT make sense is a case where 
the PSU is mounted NOT at the TOP of the case, as the case normally 
sits, but at the bottom.  Mounted at the TOP of a case, a fan is 
essential to exhaust heat.

With a PSU with vented top mounted at the bottom of the case, warm/hot 
air rises out of the PSU to be vented with CPU cooler hot air and HDD 
heat thru fans located near the top edge of the case.

In my situation, I have a cube. One half is CPU/Motherboard, the other 
is HDD/PSU with PSU mounted at the bottom of the case, UNDER the HDD 
array.  There are 2 80mm fans mounted on the rear of the case, 
exhausting air around the HDDs and above the PSU.    Yes this PSU has 
fans mounted at the case exit and on top of the PSU, but they ONLY 
exhaust the PSU!!

The CPU side has a 92mm fan that pulls air into the case.  CPU is water 
cooled using an aquarium pump in a 1 qt freezer container.  Radiator is 
a pickup truck heater core mounted on the rear of the case so that the 
fans from the HDD array exhaust thru the radiator.

There are 10 HDDs in this case, all of them mounted thru rubber 
grommets. Their rotation noise DOMINATES the noise generated by this PC.  

Sitting to the side is a Dell 2GHZ laptop.  Fan noise is a different 
pitch than HDD noise, yet the laptop rivals the cube for overall noise 
level.



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