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Installing memory modules
The following notes describe the types of dual inline memory modules (DIMMs) that
the computer supports and other information that you must consider when installing
DIMMs:
v The computer comes with either two 256 MB or two 512 MB memory DIMMs
installed in DIMM 1 and DIMM 2 memory connectors. The second pair of DIMMs
must be installed in DIMM 3 and DIMM 4 memory connectors and the third pair
in DIMM 5 and DIMM 6 memory connectors.
v DIMMs must be installed in matched pairs. The DIMMs in each pair must be the
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.
v Install only 1.8 V, 240-pin, double-data-rate 2 (DDR2), PC2-3200, registered,
synchronous dynamic random-access memory (SDRAM) with error correcting
code (ECC), dual inline memory modules (DIMMs). These DIMMs must be
compatible with the latest PC2-3200 SDRAM buffered DIMM specification. For a
list of supported options for your computer, go to http://www.ibm.com/pc/; then,
select your country and navigate to the list of options for your computer.
v The DIMM-installation sequence is based on single-rank, double-rank, and mixing
single-rank and double-rank memory DIMMs. Single-rank DIMMs are 256 MB,
512 MB, and 1 GB memory modules. Double-rank DIMMs are 2 GB memory
modules. The following table lists the DIMM-installation sequence for the
computer maximum memory capacity using mixed single-rank and double-rank
DIMMs.
Notes:
1. Do not install four, 2 GB double-rank DIMMs for the computer maximum
capacity (8 GB) configuration, the computer does not support it.
2. You can install pairs of 256 MB, 512 MB, 1 GB, and 2 GB DIMMs in the
computer, but for the computer maximum capacity, you must use the
DIMM-sequence in the table below.
3. You can install any combination of DIMM pairs in the computer, however, you
can install only two, 2 GB double-rank DIMMs in the computer and they must
go in DIMM connectors 1 and 2. Do not install 2 GB double-rank DIMMs in
any connectors other than DIMM connectors 1 and 2.
4. If you order memory DIMMs from IBM, the variable 2R in the description
indicates that the DIMM is a double-rank 2 GB DIMM.
Table 2. Maximum memory capacity (8 GB) and installation sequence mixing single-rank
and double-rank DIMMs
DIMM pair DIMM connectors DIMM size Rank
First pair 1, 2 2 GB Double-rank
Second pair 3, 4 1 GB Single-rank
Third pair 5, 6 1 GB Single-rank
v The system board contains six DIMM connectors and supports two-way memory
interleaving when the DIMMs are installed in pairs and functioning properly. If
one DIMM in the pair fails, the computer runs in single-channel mode
(non-interleaving). A failed DIMM must be replaced as soon as possible;
otherwise, the computer will not start (boot).
v The DIMM options that are available for the computer are 256 MB, 512 MB, 1
GB, and 2 GB memory modules. The computer supports a minimum of 512 MB
and a maximum of 8 MB (when using 2 GB double-rank DIMMs) of system
memory.
Chapter 4. Installing options 41