Does orientation of PSU matter?

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21 Oct 2002
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UK
Hi Folks,

I will be building my new PC tomorrow and am trying to decide how best to have my PSU. It will be in an Antec 300 so is in the bottom of the case. Shall I have the PSU the right way up (so fan is on the bottom) or upside down? What are the advantages and disadvantages of both?

The only issue I can see is that with the fan on top the wires will come out of the PSU further away from the motherboard and so I may have difficulty routing them etc.
 
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