Memory module installation rules

Your server has eight memory slots for installing or replacing DDR3 SDRAM DIMMs that provide up to a maximum of 64 GB of system memory.

The following tables provide information about the memory module installation rules that you should consider when installing a memory module. The “X” mark indicates the suggested memory slot(s) into which the memory module(s) should be installed in different situations. The number, for example 1, 2, or 3, indicates the installation sequence. See “Locating parts on the system board” on page 16 to identify the various memory slots.

Note: All memory module types and capacities must be consistent.

Table 7. 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 8. 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 19.

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.

Chapter 5. Installing, removing, or replacing hardware 23

1048, 1045, 1046, 1047 specifications

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Lenovo 1048, 1046, 1047, 1045 manual Memory module installation rules, Installing a memory module

Models: 1048 1045 1046 1047