Table 40. Memory operating modes (continued)
Memory Operating Mode
Description
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 41. Memory population rules
Processor
Configuration
Memory population
Memory population information
Single processor
Optimizer (Independent channel)
population order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
•
Populate in this order, odd
amount allowed.
•
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, A9, A10
Mirror population order
{1, 2, 3, 4, 5, 6}
Mirroring is supported with 6 DIMM
slots per processor.
Single rank sparing population
order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Populate in this order, odd amount
allowed. Requires two ranks or more
per channel.
Multi rank sparing population order 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Populate in this order, odd amount
allowed. Requires three ranks or more
per channel.
Dual processor
(Populate round robin
starting with
processor1)
Optimized (Independent channel)
population order
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}...
•
Odd amount of DIMM slots per
processor allowed.
•
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
Installing and removing system components
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