HP Workstation x4000 hp workstation x4000 - service handbook - Page 10

NOTE HP x4000 Service Information Upgrading Memory Upgrading Memory The memory for the HP x4000 Workstation is located on a Memory Expander Card, which plugs into the system board. There are two memory banks (RDRAM channels): • Bank I includes sockets 1B (J1), 2B (J2), 1A (J5), and 2A (J6). • Bank II includes sockets 3B (J3), 4B (J4), 3A (J7), and 4A (J8). This allows for a total of 8 RIMMs. You must adhere to the following rules when loading memory: • RIMMs must be loaded in matched pairs. Matching RIMMs have the same RDRAM size, speed and Mbit technology. • Each RDRAM bank (channel) must be either completely empty or completely filled as shown in Figure 1-2. Therefore, if only one pair of RIMMs is installed in a bank, then the remaining sockets in the bank must contain continuity modules (CRIMMs) to ensure continuity. All Workstations (unless they already have 8 RIMMs) ship with a pair of CRIMMs in case they are needed in future memory configurations. CRIMMS may be stored in an unused memory bank. 10 Chapter 1