IBM IntelliStation Z Pro 6221, Hardware Maintenance Manual

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2. The DIMM options available for your computer are 128 MB, 256 MB, 512 MB, 1
GB, and 2 GB. Your computer supports a minimum of 256 MB and a maximum
of 8 GB of system memory.
3. 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.
4. Your computer comes with two 256 MB or 512 MB DIMMs (for a total of 512 MB
or 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.
5. DIMMs must be installed in matched pairs. The first pair of DIMMs you install in
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.
6. Install only 133 MHz (memory bus), 2.5 V, 184-pin, double-data-rate (DDR),
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 computer, go to http://www.ibm.com/pc/ on the World
Wide Web; then, select your country and navigate to the list of options for your
computer.
7. Your computer supports Chipkill
™
memory if the DIMMs are all type x4 and are
256 MB or larger. Using any 128 MB DIMMs or DIMMs that are not type x4 on
your computer disables Chipkill memory.
Complete the following steps to install a DIMM:
1. Review “Safety notices (multilingual translations)” on page 120, “Installation
guidelines” on page 35, and “Handling electrostatic discharge-sensitive
devices” on page 120.
2. Turn off the computer and all attached devices.
3. Disconnect all power cords; then disconnect all external cables.
4. Remove the side cover (see “Removing the side cover” on page 39).
5. Remove the support bracket (see “Removing and installing the support
bracket” on page 42).
6. You might find it easier to install memory modules if you rotate the drive cage
out of the computer. Grasp the drive cage and rotate until it locks into place.
See the illustration on page 52 for additional information.
7. 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 2. DIMM installation sequence
Installation order DIMM connectors Diagnostic reference
First DIMM 3 and DIMM 4 Bank 2
Second DIMM 1 and DIMM 2 Bank 1
8. Open the retaining clips and, if necessary, remove any existing DIMM.
Installing options
55