NEC N8100-2089F User Manual page 72

Chapter 2 Preparations
1.10.7 Using memory RAS feature
This server has RAS feature including "Standard memory feature (x4 SDDC ECC memory)", "Memory
mirroring feature", "Lock Step feature (x8 SDDC ECC memory)", and Memory Sparing feature. SDDC (Single
Device Data Correction) allows automatic correction of memory error (multi-bit error).
The memory area on the motherboard of the server is divided into three memory channels.
Memory Mirroring and Memory Lock Step (x8 SDDC) features keep memory redundancy between memory
channels by monitoring or altering memory active/inactive status, respectively.
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 Refer to List of features supported by additiional memory board in 1.10.3 Memory RAS
Note
Feature before using memory RAS feature.
 Only the features that additiional memory board supports can be used.
 N8102-556F is not supported to x4 SDDC.
Memory controller
Express5800/T120e User's Guide
1. Installing Internal Optional Devices
Memory controller