Supermicro X13SWA-TF User Manual page 93

Chapter 4: UEFI BIOS
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 512.
ADDDC Sparing (Available when populating 1Rx4, 2Rx4, and 4Rx4 DIMM)
Select Enabled for Adaptive Double Device Data Correction (ADDDC) 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 mode will only start to work for ADDDC after a faulty DRAM module is
spared. The options are Disabled and Enabled.
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory errors
detected in a memory module and send the corrections 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 Disabled and Enable at End of POST. (POST is the abbreviation
for Power On Self Test.)
DDR PPR Type
Post Package Repair (PPR) is a new feature available for the DDR4/DDR5 technology.
PPR provides additional spare capacity within a DDR4/DDR5 DRAM module that is
used to replace faulty cell areas detected during system boot. PPR offers two types
of memory repairs. Soft Post Package Repair (sPPR) provides a quick, temporary fix
on a raw element in a bank group of a DDR4/DDR5 DRAM device, while hard Post
Package Repair (hPPR) will take a longer time to provide a permanent repair on a raw
element. The options are PPR Disabled, Hard PPR, and Soft PPR.
Enhanced PPR
Use this feature to set advanced memory test. Select Enabled to always execute for
every boot. Select Once to execute only one time. The options are Disabled, Enabled,
and Once
Memory PFA Support (Available when the DCMS key is activated)
Select Enabled to enable memory Predictive Failure Analysis (PFA) support. PFA can
be used to avoid uncorrectable faults in the same memory page. The options are
Disabled and Enabled.
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