General Supplementary Matters - NEC Express5800 System Configuration Manual

SYSTEM CONFIGURATION GUIDE

General Supplementary Matters

HDD

Capacity of Hard disk drive is displayed in decimal not binary. 1GB＝1000^3B、1TB=1000^4B.
PCI expansion slot

Transfer speed of PCI Express

PCI Express (PCIe):

PCI Express 2.0 (PCIe 2.0):

PCI Express 3.0 (PCIe 3.0):
Time display

A system clock is affected by temperature conditions in storage. If high accuracy of the system clock is required, use of
NPT servers is recommended.
Memory Supplementary matters
Installation rule

The number of memory which can be installed varies depending on number of installed CPUs.

This installation rule defined to maximize performance efficiently in multiple cores and tasks operation.

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 install DIMMs, higher capacity memory must be installed preferentially, if ignored this rule, it may cause failures of DIMMs. This
rule applies in 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
NEC Corporation
–
NEC Express5800/R120h-2M
2.5Gb/s (simplex) per lane
5Gb/s (simplex) per lane
8Gb/s (simplex) per lane
Revision 5.0 – January 2018
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