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Table 16. Memory operating modes (continued)
Memory Operating Mode
Multi Rank Spare Mode
Dell Fault Resilient Mode
Optimizer Mode
This mode supports Single Device Data Correction (SDDC) only for memory modules that use x4 device width. It does not
impose any specific slot population requirements.
● Dual processor: Populate the slots in round robin sequence starting with processor 1.
NOTE:
Processor 1 and processor 2 population should match.
Table 17. Memory population rules
Processor
Configuration
Single processor
Optimizer (Independent
channel) population order
Mirror population order
76
Installing and removing system components
Description
Multi Rank Spare Mode allocates two ranks per channel as a spare. If excessive
correctable errors occur in a rank or channel, while the operating system is running, they
are moved to the spare area to prevent errors from causing an uncorrectable failure.
Requires three or more ranks to be populated in each channel.
With single rank memory sparing enabled, the system
memory available to the operating system is reduced by one
rank per channel.
For example, in a
dual-processor configuration with 24x 16 GB dual-rank memory
modules, the available system memory is: 3/4 (ranks/channel) ×
24 (memory modules) × 16 GB = 288 GB, and not 24 (memory
modules) × 16 GB = 384 GB. For multi rank sparing, the
multiplier changes to 1/2 (ranks/channel).
NOTE:
To use memory sparing, this feature must be enabled in the BIOS menu of
System Setup.
NOTE:
Memory sparing does not offer protection against a multi-bit uncorrectable
error.
The Dell Fault Resilient Mode if enabled, the BIOS creates an area of memory that is
fault resilient. This mode can be used by an OS that supports the feature to load critical
applications or enables the OS kernel to maximize system availability.
NOTE:
This feature is only supported in Gold and Platinum Intel processors.
NOTE:
Memory configuration has to be of same size DIMM, speed, and rank.
Memory population
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12
{1, 2, 3, 4, 5, 6} {7, 8, 9,
10, 11, 12}
Memory population information
● DIMMs must be populated in the order
specified.
● Odd number of DIMM population is allowed
NOTE:
Odd number of DIMMs will result
in unbalanced memory configurations,
which in turn will result in performance
loss. It is recommended to populate
all memory channels identically with
identical DIMMs for best performance.
● Optimizer population order is not traditional
for 4 and 8 DIMM installations of single
processor.
○ For 4 DIMMs: A1, A2, A4, A5
○ For 8 DIMMs: A1, A2, A4, A5, A7, A8,
A10, A11
Mirroring is supported with 6 or 12 DIMMs per
processor.
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