Except computer server heat sink, camera also need heat sink. On the PCB board of camera, someone found an aluminum heat sink on the bottom of the PCB board, and a layer of insulating tape on the sensor. There is also a heat sink at the bottom of the CPU. So people speculates that this means that Canon directs the heat of the four SDRAM chips around the CPU to one heat sink and directs the heat of the CPU itself to another area.