Owners Manual

Table 9. Memory operating modes (continued)
Memory Operating Mode Description
NOTE: Memory sparing does not offer protection against
a multi-bit uncorrectable error.
Dell Fault Resilient Mode 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.
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 10. Memory population rules
Processor Configuration Memory population Memory population information
Dual processor (Start
with processor1.
processor1 and
processor 2
population should
match)
Optimized (Independent
channel) population order
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}…
● Odd amount of DIMMs per
processor allowed.
● 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 population order
A{1,2,3,4,5,6},
B{1,2,3,4,5,6}
Mirroring is supported with 6
DIMMs per processor.
Single rank sparing population
order
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}…
Populate in this order, odd amount
per processor allowed. Requires
two ranks or more per channel.
Multi rank spare population
order
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}…
Populate in this order, odd amount
per processor allowed. Requires
three ranks or more per channel.
Fault resilient population order
A{1,2,3,4,5,6},
B{1,2,3,4,5,6}
Supported with 6 DIMMs per
processor.
Removing a memory module
Prerequisites
WARNING: Allow the memory modules to cool after you power off the system.
1. Follow the safety guidelines listed in Safety instructions on page 23.
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PowerEdge C4140 installing and removing system components