Installing A Memory Module - Lenovo ThinkServer RD230 Hardware Maintenance Manual

Table 9. DIMM installation rules when a single microprocessor (CPU0) is installed
DIMM slot
CPU0 DIMM CHA1
CPU0 DIMM CHA0
CPU0 DIMM CHB0
CPU0 DIMM CHC0
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 10. DIMM installation rules when two microprocessors (CPU0 and CPU1) are installed
DIMM slot
CPU0 DIMM CHA1
CPU0 DIMM CHA0
CPU0 DIMM CHB0
CPU0 DIMM CHC0
CPU1 DIMM CHA1
CPU1 DIMM CHA0
CPU1 DIMM CHB0
CPU1 DIMM CHC0
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 and the
Warranty and Support Information on the ThinkServer Documentation DVD that comes with your product, and
Guidelines. To obtain a copy of the publications, go to:
http://www.lenovo.com/support
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.
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 38.
4. Open the retaining clips of the memory slot into which you want to install the memory module.
One DIMM Two DIMMs
X
Two DIMMs Four DIMMs
X, 1
X, 2
Three DIMMs
X, 1 X, 1
X, 2 X, 2
X, 3
Six DIMMs
X, 1 X, 1
X, 3 X, 3
X, 5
X, 2 X, 2
X, 4 X, 4
X, 6
.
Chapter 5 Installing, removing, or replacing hardware
Four DIMMs
X, 4
X, 1
X, 2
X, 3
Eight DIMMs
X, 7
X, 1
X, 3
X, 5
X, 8
X, 2
X, 4
X, 6
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