Installing Accessories
System Memory
Chapter 2 27
System Memory
NOTE Use only HP RIMMs specifically designed for your Workstation model. To
find out about available accessories for your Workstation, go to
www.hp.com/workstations/support.
Upgrading Memory
The memory for the HP x4000 Workstation is located on a Memory
Expander Card (shown in Figure 2-9 on page 28), 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 2-10. 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.
NOTE 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.
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