Memory module adapter card with multiplexer circuitry

A system comprising:

• a printed circuitry board (PCB);
• a processor mounted on the PCB, the processor coupled with a memory controller;
• a dual-inline memory module (DIMM) connector mounted to the PCB, the DIMM connector to include contacts arranged to electrically couple with input/output (I/O) interface circuitry of the memory controller;
• and
• an adaptor card, the adaptor card to include:
• first conductive contacts proximate to an edge of the adaptor card, the edge of the adaptor card arranged to be received by the DIMM connector, the first conductive contacts configured to couple with contacts included in the DIMM connector;
• second conductive contacts on a first face of the adaptor card configured to couple with a first compression attached memory module (CAMM) and to enable a communicative coupling between the I/O interface circuitry of the memory controller and the first CAMM through the first and second conductive contacts;
• third conductive contacts on a second face of the adaptor card configured to couple with a second CAMM and to enable a communicative coupling between the I/O interface circuitry of the memory controller and the second CAMM through the first and third conductive contacts;
• and
• multiplexor circuitry configured to time multiplex data access between the first CAMM and the second CAMM to enable the first CAMM to be accessed in parallel with the second CAMM being made ready for access during a first timing cycle then enable the second CAMM to be accessed in parallel with the first CAMM being ready for access during a second, subsequent timing cycle.