HP Integrity rx2620 User's & Service Manual page 67

Installing DIMMs
DIMMs must be loaded in the correct order:
• In the HP Integrity rx2620 server, DIMMs must be installed in matched quads. Two matched memory
card pairs of equal size (that is, four identical DIMMs) must be installed, one pair per memory cell, as
listed below:
• 0A, 0B and 1A, 1B must be matched pairs of equal size
• 2A, 2B and 3A, 3B must be matched pairs of equal size
• 4A, 4B and 5A, 5B must be matched pairs of equal size
NOTE DIMMs match if they have the same HP part number. The DIMMs are 184-pin,
industry-standard, DDR266, CL2, registered ECC modules. Industry standard means the
DIMMs meet specifications detailed in the JDEC Standard No. 21-C, Module 4, titled "PC2100
and PC1600 DDR SDRAM Registered DIMM Design Specification." A complete and current list
of acceptable DIMMs is provided on the parts web site at: http://partsurfer.hp.com.
Module sizes can be mixed, as long as DIMMs in each quad match, except when using 4 GB DIMMs. If you
install 4 GB DIMMS, the only configuration allowed is 8 4GB DIMMs. For example:
• It is acceptable to load a quad of 256 MB DIMMs in sockets 0A, 0B, 1A and 1B; and a quad of 1 GB
DIMMs in sockets 2A, 2B, 3A and 3B.
• If using 4GB DIMMs, the only configuration allowed is 4 GB DIMMs in slots 0A, 0B, 1A, 1B, 2A, 2B, 3A,
and 3B. Slots 4A, 4B, 5A, and 5B remain empty.
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).
Each DIMM within a quad must be identical to all the other DIMMs in the quad.
To install DIMMs, perform the following steps:
Step 1. Turn off the server and disconnect all the cables. See "Powering Off the Server" on page 42.
Step 2. Remove the server top metal cover. See "Removing the Top Metal Cover" on page 50.
CAUTION
Step 3. Holding the memory module by its left and right edges, insert the module into the socket.
The memory modules are keyed and can only be inserted in one direction. When the module is
correctly seated, the retainer clips return to their fully upright position. Snap the clips firmly into
place to ensure the DIMMs are seated properly.
Step 4. Gently and evenly push on each side of the DIMM until it seats in the socket. Ensure the extraction
levers are in the closed position. See Figure 4-24 for more information.
Chapter 4
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.
Removing and Replacing Components
Removing and Replacing Internal Components
67