describes is a memory system that utilizes motherboard traces in a way that permits maximum utilization of system data lines while accommodating varying numbers of memory modules . it is possible in a system such as this to utilize all individual sets of point - to - point signaling lines , even when less than all of the available memory sockets are occupied . memory modules with configurable data widths support a relatively wide mode in which one module utilizes all available system data lines , or a relatively narrow mode in which multiple , narrower modules split the available system data lines between them .