NEC Express5800/T120h User Manual page 81

Chapter 2 Preparations
The followings are the conditions to use this function.

Use the same type number of DIMMs for the device.
 Mount DIMMs in the DIMM socket that constitutes the spare set.
 Change the following parameters and save them.
From System Utility, set "System Configuration > BIOS/Platform Configuration (RBSU) >System Options >
Memory Operations > Advanced Memory Protection" to "Online Spare with Advanced ECC Support".
 After rebooting, confirm "Advanced Memory Protection Mode：Online Spare with Advanced ECC" is
displayed in POST.
Following memory sparing cannot be constructed.

Mounting DIMMs with different product numbers on the spare set

Memory sparing between different memory channels
Note When using Memory Sparing Function, mount 8 or 12 DIMMs per CPU.

Use memories with the same product number for the device.

Express5800/T120h User's Guide
1. Installing Internal Optional Devices
81