A chip sandwich includes a heat sink, a retention module, a computer chip mounted in a socket on a mother board, a wave washer spring and a mounting plate. The heat sink is mounted on the retention module using cams, hooks and heat sink tabs to provide an initial orientation of the heat sink over the computer chip. To provide final contact pressure between the heat sink and the computer chip, a wave washer spring oriented beneath the computer chip and under the mother board provides an upward pressure against the bottom of the mother board, and particularly against the center of the computer chip. Thus, by the wave washer spring pushing against the center of the computer chip, secure contact pressure is provided between the heat sink and the computer chip, while minimizing the amount of pressure between the computer chip's pins and the chip socket.