HP Workstation x4000, Technical Reference Manual

Page: 159 / 238

Installing or Replacing Parts and Accessories
System Memory
Chapter 10 157
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 on the 8-RIMM MEC
The memory for the HP x4000 Workstation is located on a Memory
Expander Card (shown in Figure 10-9 on page 158), 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 10-10. 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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