Chapter 5: UEFI BIOS
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Static Virtual Lockstep Mode
Select Enable to run the system's memory channels in lockstep mode to minimize
memory access latency. The options are
Disable
and Enable.
Mirror Mode
This feature allows memory to be mirrored between two channels, providing 100%
redundancy. The options are
Disable
, Mirror Mode 1LM, and Mirror Mode 2LM.
Memory Rank Sparing
Select Enable to enable memory-sparing support for memory ranks to improve memory
performance. The options are
Disable
and Enable.
Correctable Error Threshold
Use this feature to specify the threshold value for correctable memory-error logging,
which sets a limit on the maximum number of events that can be logged in the memory
error log at a given time. The default setting is
100
.
Intel Run Sure
Use this feature to enable Intel Run Sure technology. The options are
Disable
and
Enable.
SDDC Plus One
Single device data corr1 (SDDC Plus One) organizes data in a single bundle
(x4/x8 DRAM). If any or all the bits become corrupted, corrections occur. The x4 con-
dition is corrected on all cases. The x8 condition is corrected only if the system is in
Lockstep Mode. The options are
Disable
and Enable.
ADDDC Sparing
Adapative Double Device Data Correction (ADDDC) Sparing detects when the prede-
termined threshold for correctable errors is reached, copying the contents of the failing
DIMM to spare memory. The failing DIMM or memory rank will then be disabled. The
options are Disable and
Enable
.
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory errors
detected on a memory module and send the correction to the requestor (the original
source). When this feature is set to Enable, the IO hub will read and write back one
cache line every 16K cycles, if there is no delay caused by internal processing. By us-
ing this method, roughly 64 GB of memory behind the IO hub will be scrubbed every
day. The options are Disable and
Enable
.
