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Originally Posted by AntiBling
I work on wafer production equipment in a chip plant, and I see power supplies all the time with no fans. I've always thought that the fans on a PC PSU were to vent the case, not because the supply needed it.
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A lot of the time that is the case, unless you're packing like 500+W into an ATX psu box you don't much need a heatsink on it.
As for messiness, that's presumably because PSUs are made as cheaply as possible. Though as I recall mine has a single PCB in it.