PSU Cooling Design or Amperage?

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11 Dec 2011
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Hull-Oxford
whats the most important thing to look at when choosing a PSU?
the ones I'm looking at are;
corsair 750W modular enthusiast
OCZ ZS 750w
the OCZ is 9A down on the 12V and 8A down on the 5V but is this so bad for £20 less?
BUT
the corsair seems to have 3*5mm thick plates to cool the internals whereas,
the OCZ has the same but with many fins splayed out on top thus vastly increasing its ability to loose heat.

the corsairs design looks strange considering it handles more current than the OCZ and has the same if not worse efficiency rating.

can anyone please expand on this? i want a PSU which will last as long as possible, and if its having to handle more heat then surely it won't last as long!
 
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