Chapter 4: BIOS
SuperServer 5019P-MT/MTR User's Manual
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Memory Topology
This item displays the information of onboard memory modules as detected by the
BIOS.
Memory RAS Configuration
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 item 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
10
.
SDDC
Single Device Data Correction (SDDC) organizes data in a single bundle (x4/x8 DRAM).
If any or all the bits become corrupted, corrections occur. The x4 condition 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
Adaptive 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.
IO Directory Cache (IODC)
IO Directory Cache is an 8-entry cache which stores the directory state of remote IIO
writes and memory lookups, and saves directory updates. Use this feature to lower cache
to cache (C2C) transfer latencies. The options are Disable,
Auto
, Enable for Remote
InvItoM Hybrid Push, InvItoM AllocFlow, Enable for Remote InvItoM Hybrid AllocNonAlloc,
and Enable for Remote InvItoM and Remote WViLF.
Isoc Mode
Isochronous (Isoc) mode allows time-sensitive processes to be given priority. The options
are Disable, Enable, and
Auto
.
Memory Configuration
Enforce POR
Select POR to enforce POR restrictions on DDR4 frequency and voltage programming.
The options are
POR
and Disable.
Memory Frequency
Use this feature to set the maximum memory frequency for onboard memory modules.
The options are
Auto
,
1866, 2000, 2133, 2200, 2400, 2600, and 2666.
Data Scrambling for NVDIMM
Use this feature to enable or disable data scrambling for non-volatile DIMM (NVDIMM)
memory. The options are
Auto
, Disable, and Enable.
Data Scrambling for DDR4
Use this feature to enable or disable data scrambling for DDR4 memory. The options
are
Auto
, Disable, and Enable.
Enable ADR
Select Enable for ADR (Automatic Diagnostic Repository) support to enhance memory
performance. The options are
Disable
and Enable
.
Refresh Options
Use this feature to select the memory controller refresh rate. The options are Accelerated
Self Refresh and
2x Refresh
.
