1. A server comprising: a main printed circuit board; a plurality of processors mounted to the main printed circuit board; a memory system accessible to the plurality of processors, the memory system including a plurality of expansion sockets mounted to the printed circuit board, a plurality of server memory cards removeably plugged into the plurality of expansion sockets, each of the plurality of server memory cards including a baseboard printed circuit board having an edge connector, the edge connector coupled to one of the plurality of expansion sockets, a master controller coupled to the host edge connector over a host bus channel; a plurality of slave controllers coupled to the master controller over a plurality of memory bus channels, a first plurality of daughter card sockets mounted to the baseboard printed circuit board and coupled in communication respectively with the plurality of slave controllers, and a first plurality of replaceable daughter-memory-cards removeably plugged into the plurality of daughter-card sockets, each of the replaceable daughter-memory-cards including a first plurality of read-writeable non-volatile memory.