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Installing memory modules
The following notes describe the types of DIMMs that the computer supports and
other information that you must consider when you install DIMMs:
v When you restart the computer after you add or remove a DIMM, the computer
v The computer uses industry-standard PC2-5300 double-data-rate 2 (DDR2)
v The system board contains four DIMM connectors and supports two-way memory
v The optional DIMMs that are available for the computer are 512 MB, 1 GB, and 2
v The computer comes with either two 512 MB or two 1 GB DIMMs installed in the
v DIMMs must be installed in matched pairs. The DIMMs in each pair must be the
v Install only 1.8 V, 240-pin, DDR2, PC2-5300, 667 MHz, unbuffered synchronous
v The amount of usable memory will be reduced depending on the system
To install a DIMM, complete the following steps:
displays a message that the memory configuration has changed.
DIMMs.
interleaving.
GB memory modules. When you order 1 GB and 2 GB DIMM options, they
come in pairs. The computer supports a minimum of 512 MB of memory and a
maximum of 8 GB of memory.
DIMM 1 and DIMM 3 connectors. The second pair of DIMMs must be installed in
the DIMM 2 and DIMM 4 connectors.
same size, speed, type, and technology as each other but do not have to match
the other pairs. You can mix compatible DIMMs from various manufacturers.
dynamic random-access memory (SDRAM) with error correcting code (ECC)
DIMMs. These DIMMs must be compatible with the latest PC2-5300 SDRAM,
unbuffered DIMM specification. For a list of supported optional devices for the
computer, see http://www.ibm.com/servers/eserver/serverproven/compat/us/.
configuration. A certain amount of memory must be reserved for system
resources. The system summary in the Configuration/Setup Utility program
displays the total amount of installed memory and the amount of configured
memory.
1. Read the safety information that begins on page v, and the"Installation
guidelines" on page 29.
2. Turn off the computer and all attached devices (see "Turning off the computer"
on page 19); then, disconnect all power cords and external cables.
3. Remove the side cover (see "Removing the side cover" on page 35).
4. Remove the bezel (see "Removing the bezel" on page 36).
5. For easier access, place the computer on its side.
6. Remove the internal drive-bay bracket (see "Removing the internal drive-bay
bracket" on page 37).
7. Locate the DIMM connectors on the system board. Determine the connectors
into which you will install the DIMMs. Remember that DIMM 1 and DIMM 3
must be paired together (and must be the first installed pair) and DIMM 2 and
DIMM 4 must be paired together. The following table shows the DIMM
installation sequence.
Memory installation sequence
DIMMs
2 DIMMs
4 DIMMs
Connectors
1, 3
1, 3, 2, 4
Chapter 4. Installing optional devices
51
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