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Copper
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this post was submitted on 03 Mar 2026
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Technically, copper is better at heat dissipation. Aluminum is prefered because it's cheaper and lighter. For an aluminum heat sink, you could have an smaller equally performing copper heat sink. In fact, this is the case for when weight and cost isn't a priority. Some heatsinks even use a copper core to wick away heat to the rest of the aluminum heat sink.