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anyone ever buy/use one of these """pure copper""" pin heatsinks? are they actually made of copper -- or is it some fake bastard metal that performs worse than copper or aluminum? i'm trying to heat sink ~12 W from a TO-247 package. this https://www.digikey.com/en/products/detail/fischer-elektronik/ICK-S-25-x-25-x-6-5/26281936 would appear to work but there's no way in hell i'm spending $5 each.⏱ 58m↩