differences between computer grade capacitors and small can capacitors

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Can anyone tell me what the differences are between big computer grade capacitors and small can capacitors? They come in the same values and lifetimes. However I would have gassed that the small cans have a shorter lifetime because they have a smaller mass ergo are not able to dissipate heat as well. I’ve seen Mr. Pass use the small can capacitors in the Alpha 3 and the X250. All of his other amplifiers use the big computer grade capacitors.
 
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