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False Perception: Since aluminum cools more quickly once a heat source is removed, it must be more efficient at convection.
Truth: The heat source driving energy into the heat sink remains in effect until you turn off your computer. If you have aluminum pins or fins, congratulations, they will cool off more quickly than copper ones after you shutdown your PC.
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Now let us go back to the aluminum versus copper debate. Copper’s higher conductivity means is that a thinner copper fin can transmit as much heat as a thicker aluminum fin. However, on a weight-basis, aluminum can conduct more heat than copper. If weight was no object, copper holds the edge. When weight is a limitation, aluminum has the advantage. Conductivity multiplied by density is a "weighted" measure of a material’s conduction efficiency. It is this "weighted" efficiency that leads to the use of aluminum in the fins/pins of many heat sinks. It is certainly not because "aluminum gets rid of heat better than copper".
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Taken from myv65(AKA~Dave Smith*)'s article...
*famous hydro~thermal Guru!