A metal whatchamacallit -[ CrAzY Tuesday ]-

The backside of one of two heatsink devices inside an early-2010s iMac I parted out. The copper plate, held in contact with the microprocessor* with a generous amount of thermally conductive paste between the surfaces, transferred heat to the copper tubes leading to the radiator, where fans would exhaust the waste heat. (The graphics processor has its own heatsink using the same basic configuration.

 

The paint-like look of the radiator is the background reflection against the metallic film covering the sides, not from actual paint.

 

*An Intel Core i3-540, for the curious.

Done