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Note: All memory module types and capacities must be consistent.
Table 10. DIMM installation rules when a single microprocessor (CPU0) is installed
DIMM slot One DIMM Two DIMMs Three DIMMs Four DIMMs
CPU0 DIMM CHA1
X, 4
CPU0 DIMM CHA0
X X, 1 X, 1 X, 1
CPU0 DIMM CHB0
X, 2 X, 2 X, 2
CPU0 DIMM CHC0
X, 3 X, 3
Note: Installing DIMMs on channel A and channel B of CPU0 should enable Channel Mirroring Mode. This mode
requires that you install the DIMMs in pair, and the DIMM installation for Channel Mirroring Mode is one DIMM on
CPU0 DIMM CHA0 and one DIMM on CPU0 DIMM CHB0 when a single microprocessor (CPU0) is installed.
Table 11. DIMM installation rules when two microprocessors (CPU0 and CPU1) are installed
DIMM slot Two DIMMs Four DIMMs Six DIMMs Eight DIMMs
CPU0 DIMM CHA1
X, 7
CPU0 DIMM CHA0
X, 1 X, 1 X, 1 X, 1
CPU0 DIMM CHB0
X, 3 X, 3 X, 3
CPU0 DIMM CHC0
X, 5 X, 5
CPU1 DIMM CHA1
X, 8
CPU1 DIMM CHA0
X, 2 X, 2 X, 2 X, 2
CPU1 DIMM CHB0
X, 4 X, 4 X, 4
CPU1 DIMM CHC0
X, 6 X, 6
Note: For the Channel Mirroring Mode, it requires that you install the DIMMs in pair, and the DIMM installation for
Channel Mirroring Mode when two microprocessors (CPU0 and CPU1) are installed is shown below. Follow this
sequence rather than the sequence listed above if you want to use the Channel Mirroring Mode.
1. Pair 1: install a DIMM on CPU0 DIMM CHA0 and then install a DIMM on CPU0 DIMM CHB0.
2. Pair 2: install a DIMM on CPU1 DIMM CHA0 and then install a DIMM on CPU1 DIMM CHB0.
Installing a memory module
Attention: Do not open your server or attempt any repair before reading and understanding the “Safety information”
on page iii
and “Guidelines” on page 17.
This section provides instructions on how to install a memory module.
To install a memory module, do the following:
1. Remove all media from the drives and turn off all attached devices and the server. Then, disconnect all
power cords from electrical outlets and disconnect all cables that are connected to the server.
2. Remove the server cover. See “Removing the server cover” on page 19.
3. Locate the appropriate memory slot on the system board into which you will install the memory module.
To optimize system performance, follow the related memory module installation rules and install the
memory module into a memory slot starting with the memory module farthest from the microprocessor.
See “Memory module installation rules” on page 20
.
Chapter 5. Installing, removing, or replacing hardware 21