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Installing a memory module
The following notes describe the types of dual inline memory modules (DIMMs)
that the server supports and other information that you must consider when you
install DIMMs:
v The server supports only industry-standard, 1.8 V, 240-pin, double-data-rate 2
(DDR2), 800 MHz, PC2-5300 or PC2-6400, unbuffered, synchronous dynamic
random-access memory (SDRAM) dual inline memory modules (DIMMs) with
error correcting code (ECC). These DIMMs must be compatible with the latest
DDR2 800 MHz SDRAM unbuffered DIMM specification. For a list of supported
optional devices for the server, see http://www.lenovo.com/accessories.
v The optional DIMM that are available for the server are 1 GB and 2 GB. The
server supports a minimum of 1 GB and a maximum of 8 GB of system memory.
v Some servers come with two 1-GB DIMMs installed.
Depending on the DIMM sizes installed in your server, the server can support
two or four DIMMs. The 1-GB DIMM and 2-GB option kits each contain two
DIMMs.
v The system board contains four DIMM connectors and supports two-way
memory interleaving. For two-way memory interleaving, DIMMs must be
installed in matched pairs.
If one DIMM is installed in the DIMM 1 connector, when you install an
additional DIMM, it must be installed in the DIMM 3 connector, and it must be
the same size, speed, type, and technology as the DIMM in the DIMM 1
connector. You can use compatible DIMMs from various manufacturers.
If you install a second pair of DIMMs in the DIMM 2 and DIMM 4 connectors,
they do not have to be the same size, speed, type, and technology as the DIMMs
in the DIMM 1 and DIMM 3 connectors. However, the size, speed, type, and
technology of the DIMMs that you install in the DIMM 2 and DIMM 4
connectors must match each other.
v The maximum operating speed of the server is determined by the slowest
DIMM in the server.
v The server can operate in single-channel mode or dual-channel mode.
v DIMM population is based on single-rank, double-rank, or combined single-rank
and double-rank DIMMs. DIMMs must be installed in order, starting with the
DIMM connector that is farthest from the memory controller hub. Double-rank
DIMMs must be installed in the DIMM connector that is farthest from the
memory controller hub when you install a combination of single-rank and
double-rank DIMMs. The following tables show examples of populating the
server with different combinations of single-rank and double-rank DIMMs and
different operating modes.
Table 1. Single-channel mode with single-rank and double-rank DIMMs
Channel 0 Channel 1
DIMM 1 DIMM 2 DIMM 3 DIMM 4
Single-rank
Double-rank
Single-rank Single-rank
Table 2. Dual-channel mode with single-rank and double-rank DIMMs
First pair Second pair Remarks
DIMM 1 DIMM 2 DIMM 3 DIMM 4
Chapter 2. Installing optional devices 13