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A heatsink dissipates heat into the surrounding air and thus provides cooling.

20 votes
12 answers
15k views

Does the paint colour matter on a heat sink?

Heat leaves a heat sink via conduction, convection and radiation. I was taught that black surfaces are best at radiating heat and correspondingly a lot of heat sinks are black. But they also have fi …
Paul Uszak's user avatar
  • 7,621
30 votes
7 answers
12k views

Why aren't CPUs cooled from below as well as above?

The transistory bits of an integrated circuit are approximately in the centre of the (plastic or ceramic) package. They sometimes get hot, and we cool them by affixing a heat sink to one side. Somet …
Paul Uszak's user avatar
  • 7,621