Memory Functions - NEC EXP805 User Manual

Chapter 2 Preparations

Memory functions

This server is equipped with the "Advanced ECC function", "Memory ADDDC function", "Memory Mirroring
function", and "Memory Sparing function" as memory RAS functions.
The "Advanced ECC function" corrects memory errors to continue operation when errors occur on the same
DRAM device on the DIMM.
When the "Memory ADDDC function" is used, the server can correct memory errors to continue operation when
errors occur on multiple DRAM devices on the DIMM. This provides more protection against uncorrectable
memory errors than provided by Advanced ECC.
The "Memory Mirroring function" and "Memory Sparing function" create redundancy by monitoring and switching
memory between memory channels. These functions are described on the following pages.
Memory RAS functions supported vary depending on the memory installed. Refer to the table below.
N Code
N8102-720
N8102-721
N8102-722
N8102-723
N8102-724
N8102-725
N8102-726
*1 The Single Device Data Correction (SDDC) function automatically corrects data when one of the memory
chips of a DIMM fails.
The motherboard of this device has six separate "memory channels" for controlling memory.
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Advance ECC Memory ADDDC
Function Function
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 (x4 SDDC)*1
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 (x4 SDDC)*1
 (x4 SDDC)*1
 (x4 SDDC)*1
 (x4 SDDC)*1
Express5800/R120h-2M (2nd-Gen) User's Guide
Memory Mirroring
Function
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1. Installing Internal Optional Devices
Memory Sparing
Function
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