NEC EXP805 User Manual page 87

Chapter 2 Preparations
Mount DIMMs in the DIMM slot constituting a spare set.
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Change the following parameters and save them.
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From System Utility, set "System Configuration > BIOS/Platform Configuration (RBSU) > Memory
Oprations > Advanced Memory Protection" to "Online Spare with Advanced ECC Support".
After rebooting, confirm "Advanced Memory Protection Mode：Online Spare with Advanced
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ECC" is displayed in POST.
The following memory sparrings cannot be constructed.
Mounting DIMMs with different product numbers on the spare set
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Memory sparing between different memory channels
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Notes for the configuration of memory sparing
Even if you set "Advanced Memory Protection" to "Online Spare with Advanced ECC Support" and
select memory sparing configuration, in case DIMM configuration which cannot constitute memory
sparing due to expansion or removal of DIMM is detected, "Advanced Memory Protection" operates
as "Advanced ECC Support".
In this case,"Advanced ECC Support" is displayed in POST's "Advanced Memory Protection Mode".
IML also records the relevant error events.
Notes for replacements at failure
At the time of failure, identify damaged DIMM(s) from IML and replace DIMM(s) one by one.
 When using Memory Mirroring Function, install 12 DIMMs per CPU.
Note
 Use memories with the same product number for the device.
Express5800/R120h-2M (2nd-Gen) User's Guide
1. Installing Internal Optional Devices
87