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Macbook air heatsink

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TheChas

The design of the heatsink is not uncommon on laptops, especially thin laptops.

If you look closely at the area with the thermal paste, you will see that copper comes in direct contact with the CPU.

The black on the processor portions is likely a material layer. Either for thermal or electrical isolation.

The black part joining the two processor sections is usually a duct. The fan is remote, and airflow through the duct is the cooling mechanism. Some even use a closed loop fluid or gel that transfers the heat from the processor to the end with the fan.

Also keep in mind that most mobile processors are designed to use less power and thus run cooler than their desktop counterparts.

Chas