Abstract: Disclosed is a cavity-stacked printed circuit board (PCB) assembly that includes a first PCB formed of glass-reinforced epoxy material and has a first and a second side. The first side includes an open cavity with a cavity floor and at least one side wall that extends between the floor and the first side. The open cavity defines a cavity perimeter, which includes a base defined around the perimeter. The second PCB has a top side opposite a bottom side. The top side has an electrical component around which an interposer region is defined. Solder is disposed between the interposer region of the second PCB and the base of the first PCB to couple the first PCB to the second PCB with the electrical component received in the cavity to form the cavity-stacked PCB assembly.