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 industry-standard, 667 MHz, unbuffered PC2-5300,
double-data-rate 2 (DDR2) dual inline memory modules (DIMMs) error correcting
code (ECC) memory.
v The system board contains four DIMM connectors and supports two-way memory
interleaving.
v The DIMM options that are available for the server are 512 MB, 1 GB, and 2 GB.
The server supports a minimum of 512 MB and a maximum of 8 GB of system
memory.
v The server comes with one 512 MB DIMM or two 512 MB DIMMs installed.
v The amount of usable memory will be reduced depending on the system
configuration. A certain amount of memory must be reserved for system
resources. To view the total amount of installed memory and the amount of
configured memory, run the Configuration/Setup Utility program and select
System Summary from the menu. For additional information, see the User’s
Guide on the IBM System x Documentation CD.
v 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 mix 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 Install only 1.8 V, 240-pin, double-data-rate 2 (DDR2), 667 MHz, PC2-5300,
unbuffered synchronous dynamic random-access memory (SDRAM) with error
correcting code (ECC) DIMMs. These DIMMs must be compatible with the latest
DDR2 667 MHz SDRAM unbuffered DIMM specification. For a list of supported
optional devices for the server, see http://www.ibm.com/servers/eserver/
serverproven/compat/us/.
v When you restart the server after you add or remove a DIMM, the server
displays a message that the memory configuration has changed.
Chapter 2. Installing optional devices 13
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