In dual-processor systems, populate DIMMs into DIMM sockets starting with processor 0 (P0) D0, then, alternating between sockets associated with processor 0 (P0) and matching sockets for processor 1 (P1). Fill the black sockets, then the black sockets with white tabs, and finally, the white sockets, as shown in the following figure. Notice that the order of populating the black DIMM sockets is Ch C first, Ch A second, Ch D third, and Ch B last. Repeat the same population sequence for the black sockets with white tabs, and finally, for the white sockets.
Figure 5 DIMM Population Order for Dual-Processor Systems
The following table describes the proper order in which to install DIMMs in a dual-processor system using the numbered callouts in the above figure, the memory channel labels (Ch A through Ch D), and the DIMM socket labels (D0 through D11).