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Memory RAS (Reliability_Availability_Serviceability) Configuration
Use this submenu to configure the following Memory RAS settings.
Static Virtual Lockstep Mode
Select Enable to support Static Virtual Lockstep mode to enhance memory performance.
The options are Enable and Disable.
Mirror Mode
Use this feature to configure the mirror mode settings for all 1LM/2LM memory modules
installed in the system which will create a duplicate copy of data stored in the memory to
increase memory security, but it will reduce the memory capacity into half. The options are
Disable, Mirror Mode 1LM, and Mirror Mode 2LM.
Memory Rank Sparing
Select Enable to support memory-rank sparing to optimize memory performance. The
options are Enable and Disable.
Note: This item will not be available when memory mirror mode is set to Mirror Mode
1LM or an AEP device is plugged in.
Correctable Error Threshold
Use this feature to enter the threshold value for correctable memory errors. The default
setting is 512.
Intel Run Sure
Select Enable to use Intel Run Sure Technology which will enhance critical data protection
and increase system uptime and resiliency. The options are Enable and Disable.
SDDC/SDDC Plus One
SDDC (Single Device Data Correction) checks and corrects single-bit or multiple-bit (4-bit
max.) memory faults that affect an entire single x4 DRAM device. SDDC Plus One, an
enhanced feature to SDDC, copies data stored in a faulty DRAM device to a spare device
when an SDDC event has occurred. After the event, the SDDC+1 ECC mode is activated
to protect against any additional memory failure caused by a 'single-bit' error in the same
memory rank. The options are Enable and Disable. (Note: SDDC or SDDC Plus One is
available when it is supported by the processors installed on the motherboard.)
ADDDC Sparing (Available when Intel Run Sure is set to Enable)
Select Enable for ADDDC (Adaptive Double Device Data Correction) support, which will
not only provide memory error checking and correction but will also prevent the system
from issuing a performance penalty before a device fails. Please note that virtual lockstep
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Chapter 4: UEFI BIOS
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