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RX900 S1 Maintenance Manual 359
Appendix
16.3 Memory board configuration
Basic rules for the population order of DIMM memory modules:
● DIMM memory modules with different capacities are installed from highest
to lowest capacity.
● Subdivide the total number of DIMM memory modules such that the same
multiple of four modules is placed on each CPUMEMR.
● If there are DIMM memory modules left after each CPUMEMR has the same
multiple of four DIMM memory modules, insert four DIMM memory modules
on each CPUMEMRs, starting with CPUMEMR#1, until all DIMM memory
modules are installed.
● Avoid mixing of DIMM memory modules from different supplies as much as
possible. Use at least DIMM memory modules of the same supplier in the
upper part (slot 1F to 2H) and the lower part (slot 1A to 2D) of an individual
CPUMEMR.
I Only use identical DIMM memory modules in the minimum configuration.
Table 5 shows the DIMM slot population order and the mapping of DIMM slots
to CPUs and IOHs for 4, 6, and 8 CPUMEMRs.
CPU
No.
DIMM
slot
pop.
order
4 CPUMEMRs 6 CPUMEMRs 8 CPUMEMRs IOH
No.
1B
1D
1F
1H
1A
1C
1E
1G
2B
2D
2F
2H
2A
2C
2E
2G
1B
1D
1F
1H
1A
1C
1E
1G
2B
2D
2F
2H
2A
2C
2E
2G
1B
1D
1F
1H
1A
1C
1E
1G
2B
2D
2F
2H
2A
2C
2E
2G
CPU#1 1 x -- -- -- x -- -- -- x -- -- -- #1
2 xx----xx----xx----
3 xxx--xxx--xxx--
4 xxxxxxxxxxxx
CPU#2 1 x -- -- -- x -- -- -- x -- -- -- #1
2 xx----xx----xx----
3 xxx--xxx--xxx--
4 xxxxxxxxxxxx
Table 5: DIMM slot population order and mapping of DIMM slots to I/O Hubs and CPUs