Memory Supplementary Matters - NEC Express5800 System Configuration Manual

SYSTEM CONFIGURATION GUIDE

Memory Supplementary Matters

Installation rule

The number of memory which can be installed varies depending on number of installed CPUs.

This installation rule is defined to maximize performance efficiently in multiple cores and tasks operation.
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Registered DIMM (RDIMM), Load Reduced DIMM (LRDIMM) can be installed up to 12 per 1CPU.

Mixing of RDIMM and LRDIMM is not allowed to be installed.
When installing DIMMs, higher capacity memory must be installed preferentially, if this rule is ignored, it may cause failures of DIMMs.
This rule applies to the factory installation.
For dual CPU system, install DIMM to CPU1 firstly and then to CPU2 alternately.
Memory population varies with number of installed DIMMs. In installation of 5, 7, 9 or 11 DIMMs per CPU, optimal performance might
NOT be obtained. Other memory populations are recommended.
Single CPU system
Dual CPU system
1-3x DIMM(s)
5-7x DIMMs
NEC Corporation
–
NEC Express5800/R120h-1M
4x DIMMs
8x DIMMs
Revision 7.0 – July 2018
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