Conductive stress-relief washers in microelectronic assemblies

An electronic computing device, comprising:

• a mother board including a screw mount electrically coupled to a ground plane of the motherboard, and an edge connector socket;
• a solid state drive (SSD) including a plurality of non-volatile memory ICs mounted to a printed circuit board (PCB), the PCB having:
• edge connector traces at a first edge of the PCB mated with the edge connector socket, the traces coupled to the memory ICs;
• a semicircular indent or through hole at a second edge of the PCB;
• and
• an electrically conductive trace adjacent to an edge of the indent or through hole, and electrically coupled to a ground plane of the PCB;
• a screw affixing the PCB to the motherboard, the screw passing through the indent or hole;
• and
• an annular washer surrounding the screw and located between a head of the screw and the electrically conductive trace, wherein:
• the ground planes of the PCB and motherboard are electrically coupled through at least the washer;
• the PCB is thermally coupled to the motherboard through at least the washer;
• and the washer is elastically deformed between a head of the screw and the PCB;
• wherein the washer comprises a material having a hardness below 50 Shore C;
• wherein the washer comprises a material having a thermal conductivity of at least 1 W/m-K;
• and
• wherein the washer comprises a material having a volume resistivity no more than 1.0×104 Ω-cm.