HP 9000 rp3440 Installation Manual page 51

• Memory must be loaded in the specific order outlined on the system board
• Memory can be ordered in amounts of 512 MB (2 x 256 MB), 1 GB (4 x 256 MB), 2 GB (4 x 512 MB), 4 GB
(4 x 1 GB), 8 GB (4 x 2 GB), and 16 GB (4 x 4 GB)
• Each quad of memory is loaded across both memory buses (two DIMMs on each bus) to ensure maximum
bandwidth and performance
• Total memory bandwidth is 8.5 GB/s, split across two 4.25 GB/s memory buses
• Open page memory latency is 80 nanoseconds
The memory subsystem supports chip-spare functionality. Chip spare enables an entire SDRAM chip on a
DIMM to be bypassed (logically replaced) in the event that a multi-bit error is detected on that SDRAM.
In order to use the chip spare functionality, only DIMMs built with x4 SDRAM parts can be used, and these
DIMMs must be loaded in quads (two DIMMs per memory cell, loaded in the same location in each memory
cell).
System Firmware Requirements
If you are using 4 GB DIMMs in a HP 9000 rp3440 server, system firmware must be greater than revision
44.24. Use the BCH command FV, or the MP command SR to display the system firmware revision status. If
necessary, use the MP command SR to upgrade system firmware. (Detailed instructions are downloaded with
the upgrade.)
Installation Procedure
To install DIMMs, perform the following steps:
Step 1. Turn off the system and disconnect all power and external cables.
Step 2. Remove the system cover. (See "Removing and Replacing System Covers and Bezels" on page 25.)
Step 3. Remove the memory airflow guide. (See "Removing the Memory Airflow Guide" on page 41.)
CAUTION
Step 4. Locate the slot into which the DIMM will be installed. Holding the memory module by its left and
right edges, insert the module into the socket (Figure 2-34.)
NOTE
Chapter 2
To ensure that memory modules are not damaged during removal or installation,
power off the server and unplug the power cord from the AC power outlet. Wait until
the LED on the back of the power supply turns off before removing or installing
memory.
The memory modules are keyed and can only be inserted in one direction. When the
module is correctly seated, the retainer clips will return to their fully upright
position. Snap the clips firmly into place to ensure that the DIMMs are seated
properly.
Installing and Configuring
Installing Additional System Memory
51