Installing Memory Modules - IBM xSeries 225 8647 Installation Manual

Installing memory modules

You can increase the amount of memory in your server by installing memory
modules. Your server uses industry-standard PC2100 double-data-rate (DDR) dual
inline memory modules (DIMMs).
Notes:
1. The system board contains four DIMM connectors and supports two-way
2. The DIMM options available for your server are 128 MB, 256 MB, 512 MB, 1
3. The amount of usable memory will be reduced depending on the system
4. Your server comes with two 256 MB or 512 MB DIMMs (for a total of 512 MB or
5. DIMMs must be installed in matched pairs. The first pair of DIMMs you install in
6. Install only 133 MHz (memory bus), 2.5 V, 184-pin, double-data-rate (DDR),
7. Your server supports Chipkill
Complete the following steps to install a DIMM:
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IBM xSeries 225 Type 8647: Option Installation Guide
memory interleaving.
GB, and 2 GB. Your server supports a minimum of 256 MB and a maximum of 8
GB of system memory.
configuration. A certain amount of memory must be reserved for system
resources. The BIOS will display the total amount of installed memory and the
amount of configured memory.
1024 MB) installed in the DIMM 3 and DIMM 4 memory connectors. When you
install additional DIMMs, be sure to install them as a pair in DIMM connectors 1
and 2.
DIMM 3 and DIMM 4 memory connectors must be the same size, speed, type,
and technology. You can mix compatible DIMMs from various manufacturers. If
you install a second pair of DIMMs in DIMM 1 and DIMM 2 memory connectors,
they do not have to be the same size, speed, type, and technology as the
DIMMs you installed in DIMM 3 and DIMM 4 memory connectors. However, the
size, speed, type, and technology of the DIMMs you install in DIMM 1 and
DIMM 2 memory connectors must match each other.
PC2100, registered synchronous dynamic random-access memory (SDRAM)
with error correcting code (ECC) DIMMs. These DIMMs must be compatible
with the latest PC2100 SDRAM Registered DIMM specification. For a list of
supported options for your server, go to http://www.ibm.com/us/compat/ on the
World Wide Web.
MB or larger. Using any 128 MB DIMMs or DIMMs that are not type x4 on your
server disables Chipkill memory.
1. Review the safety information beginning on page v, "Installation guidelines" on
page 7, and "Handling static-sensitive devices" on page 8.
2. Turn off the server and disconnect all power cords and external cables; then,
remove the side cover (see "Removing the side cover" on page 10).
3. Remove the support bracket (see "Removing and installing the support
bracket" on page 12).
4. Locate the DIMM connectors on the system board. Determine the connectors
into which you will install the DIMMs. Install the DIMMs in the order shown in
the following table.
Table 3. DIMM installation sequence
Installation order
First
Second
™
memory if the DIMMs are all type x4 and are 256
DIMM connectors
DIMM 3 and DIMM 4
DIMM 1 and DIMM 2
Diagnostic reference
Bank 2
Bank 1