A plate (usually aluminum) containing internal tubing through which cooling is provided, to absorb heat transferred to the plate by transistors and other components mounted on it.
Heat Pipe Cold Plate
A cold plate that utilizes heat pipes in order to provide the internal cooling in order to remove the heat that has been transferred to the plate and cool electronics. Heat pipe cold plates are passive and increase the thermal conductivity of the cold plate base material significantly.
Liquid Cold Plate
A cold plate that utilizes pumped liquid to provide the internal cooling necessary to remove the heat that has been transferred to the plate.