v The maximum available memory is reduced to 2/3 of the installed memory whenmemory online-spare mode is enabled. For example, if you install 96 GB ofmemory using RDIMMs, only 64 GB of addressable memory is available whenyou use memory online-spare.The following table shows the installation sequence for installing DIMMs for eachmicroprocessor in memory online-spare mode:Table 9. Memory online-spare mode DIMM populationsequenceInstalledMicroprocessor DIMM connectorMicroprocessor 1 3, 6, 83, 6, 8, 2, 5, 7Microprocessor 2 11, 14, 1611, 14, 16, 10, 13, 15Installing a DIMMTo install a DIMM, complete the following steps:1. Read the safety information that begins on page vii and “Installation guidelines”on page 31.2. Turn off the server and peripheral devices, and disconnect the power cord andall external cables (see “Turning off the server” on page 19).3. Remove the server cover (see “Removing the cover” on page 40).4. Remove the air baffle (see “Removing the air baffle” on page 41).5. Open the retaining clip on each end of the DIMM connector.Attention: To avoid breaking the retaining clips or damaging the DIMMconnectors, open and close the clips gently.6. Touch the static-protective package that contains the DIMM to any unpaintedmetal surface on the server. Then, remove the DIMM from the package.7. Turn the DIMM so that the DIMM keys align correctly with the connector.8. Insert the DIMM into the connector by aligning the edges of the DIMM with theslots at the ends of the DIMM connector. Firmly press the DIMM straight down68 System x3620 M3 Type 7376: Installation and User’s Guide
