The CPC's internal +5V supply should be disconnected when connecting the external power-supply, otherwise something terrible might happen (for example, when one supply tries to output a few more volts than the other, or so).
The giant cooling plate (and the LM323K voltage regulator) aren't meant to be mounted directly on the PCB, but rather stacked a few centimenters above of the PCB (can been be seen on photos in some of the later adverts).
== Alternate Versions ==