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Yes, fan is cheaper.

- Copper is one of the most expensive materials, and it is hard enough, and have high melting temperature, so manufacturing also more expensive than from plastics.

When micro computers was inside 15W TDP this was not a problem, as heatsink was tiny, but for modern commodity designs, 25W+, need to use all surface of notebook as heatsink (at least one side of "shell"), this would be very expensive.


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