Abstract: Actively cooled heat-dissipation lid for removing excess heat from heat-generating devices attached to printed circuit boards, processor assemblies and other electronic devices, the actively cooled heat-dissipation lid comprising a first plate configured to be placed in thermal communication with a heat-generating device, a raised sidewall to facilitate fastening the actively cooled heat-dissipation lid to the printed circuit board or processor assembly, and thereby defining a device chamber for the heat-generating devices on the printed circuit board to reside. A second raised sidewall extends from the opposite surface of the first plate to join with a second plate in a spaced relation to the first plate, wherein the opposite surface of the first plate, the second raised sidewall and the second plate together define a fluid chamber that is adjacent to the device chamber, the fluid chamber being configured to prevent any cooling fluid flowing therethrough to enter the adjacent device chamber.