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RX900 S2 Upgrade and Maintenance Manual 361

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 9 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.

CPU#1 1 x -- -- -- x -- -- -- x -- -- -- #1

2 x x ----x x ----x x ----

3 xxx--xxx--xxx--

4 xxxxxxxxxxxx

CPU#2 1 x -- -- -- x -- -- -- x -- -- -- #1

2 x x ----x x ----x x ----

3 xxx--xxx--xxx--

4 xxxxxxxxxxxx

Table 9: DIMM slot population order and mapping of DIMM slots to I/O Hubs and CPUs

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