IBM 622138U - IntelliStation Z - Pro 6221, User Manual, Page: 67 / 142

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 the safety information beginning on page vii, “Installation guidelines” on
page 27, and “Handling static-sensitive devices” on page 28.
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 31).
5. Remove the support bracket (see “Removing and installing the support
bracket” on page 33).
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 42 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.
9. Touch the static-protective package containing the DIMM to any unpainted
metal surface on the computer. Then remove the new DIMM from the package.
10. Gently open the retaining clip on each end of the DIMM slot. Turn the DIMM
so that the pins align correctly with the connector.
Chapter 4. Installing options
45