Dell Precision 420 System Documentation Update (Memory Upgrade) - Page 8

Figure 1-1 shows the RIMMs and RIMM sockets. top of system Socket RIMMB_1 Socket RIMMA_2 Socket RIMMB_3 Socket RIMMA_4 Figure 1-1. RIMMs and RIMM Sockets RIMM Installation Guidelines When you add RIMMs, you must install them in matched pairs (pairs of identical capacity). If only one pair of RIMMs is installed, they must occupy sockets RIMMB_1 and RIMMA_2, and you must install continuity RIMMs (CRIMMs) in sockets RIMMB_3 and RIMMA_4. Table 1-1 lists sample memory configurations. Table 1-1. Sample RIMM Configuration Options Total Desired Memory RIMMB_1 RIMM Socket RIMMA_2 RIMMB_3 RIMMA_4 128 MB 64 MB 64 MB CRIMM CRIMM 256 MB 64 MB 64 MB 64 MB 64 MB 256 MB 128 MB 128 MB CRIMM CRIMM 1-4 System Memory Upgrade