DIMM in channel 1, and the third DIMM in channel 2. The DIMMs must be
identical in size, type, rank, and organization, but not in speed. The channels run
at the speed of the slowest DIMM in any of the channels.
v The maximum available memory is reduced to 2/3 of the installed memory when
memory online-spare mode is enabled. For example, if you install 96 GB of
memory using RDIMMs, only 64 GB of addressable memory is available when
you use memory online-spare.
The following table shows the installation sequence for installing DIMMs for each
microprocessor in memory online-spare mode:
Table 14. Memory online-spare mode DIMM population
sequence
Installed
Microprocessor DIMM connector
Microprocessor 1 3, 6, 8
3, 6, 8, 2, 5, 7
Microprocessor 2 11, 14, 16
11, 14, 16, 10, 13, 15
To install a DIMM, complete the following steps:
1. Open the retaining clip on each end of the DIMM connector.
Attention: To avoid breaking the retaining clips or damaging the DIMM
connectors, open and close the clips gently.
2. Touch the static-protective package that contains the DIMM to any unpainted
metal surface on the server. Then, remove the DIMM from the package.
3. Turn the DIMM so that the DIMM keys align correctly with the connector.
4. Insert the DIMM into the connector by aligning the edges of the DIMM with the
slots at the ends of the DIMM connector. Firmly press the DIMM straight down
into the connector by applying pressure on both ends of the DIMM
simultaneously. The retaining clips snap into the locked position when the
DIMM is firmly seated in the connector.
Attention: If there is a gap between the DIMM and the retaining clips, the
DIMM has not been correctly inserted; open the retaining clips, remove the
DIMM, and then reinsert it.
5. Repeat steps 2 through 4 until all the new or replacement DIMMs are installed.
166 IBM System x3630 M3 Type 7377: Problem Determination and Service Guide
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