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Originally Posted by BrianG
Yeah, material does matter. I can see copper having better results with longer fins while aluminum having better results with shorter but more numerous fins...
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It wouldn't make much of any difference using copper fins rather than aluminum fins. I've seen this lot's with CPU heatsinks, copper version of the very same one, was only 2-3 C lower temps than aluminum one. The most important part is the heatspreader, which SHOULD be copper, as that is where the highest heat density is, right?