Installing A Memory Module - Lenovo ThinkServer RD240 Hardware Maintenance Manual

Table 8. DIMM installation rules when two microprocessors (CPU0 and CPU1) are installed (continued)
DIMM slot
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.
4. Open the retaining clips of the memory slot into which you want to install the memory module.
Figure 9. Opening the retaining clips of the memory slot
5. Touch the static-protective package that contains the new memory module to any unpainted metal
surface on the outside of the server. Then, remove the new memory module from the package.
6. Position the new memory module over the memory slot. Make sure that the notch
module is aligned with the key
into the memory slot until the retaining clips close and the new memory module snaps into position.
Two DIMMs Four DIMMs
2
in the memory slot. Then, press the new memory module straight down
Six DIMMs Eight DIMMs
X, 6
1 on the new memory
.
Chapter 5 Replacing FRUs
X, 6
39