IBM IntelliStation M Pro Hardware Maintenance Manual page 55

Notes:
1. When you restart the computer after adding or removing a DIMM, the computer
displays a message that the memory configuration has changed.
2. Your IntelliStation M Pro Type 6220 computer uses industry-standard, PC2700
or PC3200 double-data-rate (DDR) dual inline memory modules (DIMMs).
3. The system board contains four DIMM connectors and supports two-way
memory interleaving.
4. The DIMM options available for your computer are 256 MB, 512 MB, and 1 GB
memory modules . Your computer supports a minimum of 256 MB and a
maximum of 4 GB of system memory.
5. The amount of usable memory will be reduced depending on the system
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.
6. Your computer comes with either one or two 256 MB, 512 MB, or 1 GB memory
DIMMs installed. If your computer has one DIMM installed, when you install an
additional DIMM, it must be installed in DIMM 3 memory connector and must be
the same size, speed, type, and technology as the DIMM installed in DIMM 1
memory connector. You can mix compatible DIMMs from various manufacturers.
When one DIMM is installed in the computer, the computer runs as a
single-channel computer. When you add a DIMM in DIMM 3 memory connector,
your computer defaults to a dual-channel computer.
7. DIMMs must be installed in matched pairs. The first pair of DIMMs you install in
DIMM 1 and DIMM 3 memory connectors must be the same size, speed, type,
and technology. You can mix compatible DIMMs from various manufactures. If
you install a second pair of DIMMs in DIMM 2 and DIMM 4 memory connectors,
they do not have to be the same size, speed, type, and technology as the
DIMMs installed in DIMM 1 and DIMM 3 memory connectors. However, the size,
speed, type, and technology of the DIMMs you install in DIMM 2 and DIMM 4
memory connectors must match each other.
8. Install only 2.5 V, 184-pin, double-data-rate (DDR) 333 or 400, PC2700 or
PC3200, unbuffered synchronous dynamic random-access memory (SDRAM)
with error correcting code (ECC) DIMMs. These DIMMs must be compatible
with the latest PC2700 or PC3200 SDRAM unbuffered 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.
Complete the following steps to install a DIMM:
1. Review the safety information beginning on page 129, "Installation guidelines"
on page 31, and "Handling static-sensitive devices" on page 31.
2. Turn off the computer and all attached devices (see "Turning off the computer"
on page 10); then, disconnect all power cords and external cables.
3. Remove the cover (see "Removing the cover" on page 34).
4. Remove the support bracket (see "Removing and installing the support
bracket" on page 35).
5. For easier access to the memory modules, rotate the drive cage out of the
computer. Grasp the drive cage and rotate it until it locks into place.
6. 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 pair installed) and DIMM 2 and
DIMM 4 must be paired together. The following table shows the DIMM
installation sequence.
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Installing options