Chapter 2. Architecture and technical overview 49Figure 2-9 Memory DIMM topologyThere are 16 buffered DIMM slots on the PS703 and PS704 base blade shown in Figure 2-9,with an additional 16 slots on the PS704 expansion unit. The PS703 and the PS704 baseblade have slots labelled P1-C1 through P1-C16 as shown in Figure 2-9. For the PS704expansion unit the numbering is the same except for the reference to the second planarboard. The numbering is from P2-C1 through P2-C16.The memory-placement rules are as follows: Install DIMM fillers in unused DIMM slots to ensure proper cooling. Install DIMMs in pairs (1 and 4, 5 and 8, 9 and 12, 13 and 16, 2 and 3, 6 and 7, 10 and 11,and 14 and 15). Both DIMMs in a pair must be the same size, speed, type, and technology. You can mixcompatible DIMMs from different manufacturers. Each DIMM within a processor-support group (1-4, 5-8, 9-12, 13-16) must be the samesize and speed. Install only supported DIMMs, as described on the ServerProven web site. See:http://www.ibm.com/servers/eserver/serverproven/compat/us/DIMMs should be installed in specific DIMM sockets depending on the number of DIMMs toinstall. This is described in the following tables. See Figure 2-9 for DIMM socket physicallayout compared to the DIMM location codes.For the PS703, Table 2-5 shows the required placement of memory DIMMs depending on thenumber of DIMMs installed.SMISMISMISMISMISMISMISMIPOWER7Processor 1POWER7Processor 0DIMM 1 (P1-C1)DIMM 2 (P1-C2)DIMM 3 (P1-C3)DIMM 4 (P1-C4)DIMM 5 (P1-C5)DIMM 6 (P1-C6)DIMM 7 (P1-C7)DIMM 8 (P1-C8)DIMM 9 (P1-C9)DIMM 10 (P1-C10)DIMM 11 (P1-C11)DIMM 12 (P1-C12)DIMM 13 (P1-C13)DIMM 14 (P1-C14)DIMM 15 (P1-C15)DIMM 16 (P1-C16)
