HP LH4r HP Netserver LXr 8000 Installation Guide - Page 45

Chapter 5 Installing Additional Memory • All DIMMs within a bank must be identical in size and speed. A bank must contain either all 64 MB DIMMs or all 256 MB DIMMs. • Banks of 64 MB DIMMs and 256 MB DIMMs can coexist on the same memory board. • The minimum memory configurationis four 64 MB DIMMs in one bank on the primary (right-hand) memory board, and no DIMMs on the left-hand board. When the system has two memory boards but only four DIMMs, all four DIMMs must be on the primary memory board. (The left-hand, secondary, board must always be in the system, even if it holds no DIMMs.) • For board-to-board interleaving, each memory board must hold the same number of DIMMs. If one board holds two types of DIMMs, the other board must also, and in the same banks. (For example, if one memory board holds eight 256 MB DIMMs in Banks A and B and eight 64 MB DIMMs in Banks C and D, the other board must match this configuration exactly if card-to-card interleaving is to take place.) NOTE There is no special order for interspersing banks of 64 MB and 256 MB DIMMs on memory boards. Any arrangement is allowed. Board-to-board interleaving offers enhanced performance, and is recommended. Figures 5-4 and 5-5 show memory configurations for eight, 16, 24, and 32 DIMMs using two interleaved memory boards. The diagram assumes that corresponding banks on each board both hold the same size of DIMM module. 37