A memory system architecture/interconnect topology includes a configurable width buffered memory module having a configurable width buffer device with at least one switch element. A buffer device, such as a configurable width buffer device, is positioned between or with at least one integrated circuit memory device positioned on a substrate surface of a memory module, such as a DIMM. A switch element is positioned on or off a memory module and includes two transistors in embodiments of the invention. One or more switch elements are coupled to one or more channels to allow for upgrades of memory modules in a memory system. An asymmetrical switch topology allows for increasing the number of memory modules to more than two memory modules without adding switch elements serially on each channel. Switch elements allow for increasing the number of ranks of memory modules in a system, while also achieving many of the benefits associated with point-to-point topology.