Dell PowerEdge R840 EMC Installation and Service Manual - Page 78

Table 15. Memory population rules, For 8 DIMMs: A1, A2, A4, A5, B1, B2, B4, B5

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• Quad processor: Populate the slots in round robin sequence starting with processor 1. NOTE: Processor 1, processor 2, processor 3, and processor 4 population should match. Table 15. Memory population rules Processor Configuration Dual processor (Start with processor1. processor1 and processor 2 population should match) Optimized (Independent channel) population order Memory population A{1}, B{1}, A{2}, B{2}, A{3}, B{3}, A{4}, B{4}, A{5}, B{5}, A{6}, B{6} Mirroring population order A{1, 2, 3, 4, 5, 6}, B{1, 2, 3, 4, 5, 6}, A{7, 8, 9, 10, 11, 12}, B{7, 8, 9, 10, 11, 12} Memory population information Odd number of DIMM population per processor 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. NOTE: For best performance, 6 DIMMs or 12 DIMMs per processor is recommended. Optimizer population order is not traditional for 8 and 16 DIMMs installations for dual processor. • For 8 DIMMs: A1, A2, A4, A5, B1, B2, B4, B5 • For 16 DIMMs: A1, A2, A4, A5, A7, A8, A10, A11 B1, B2, B4, B5, B7, B8, B10, B11 Mirroring is supported with 6 or 12 DIMMs per processor. Single rank sparing population order A{1}, B{1}, A{2}, B{2}, A{3}, B{3}, A{4}, B{4}, A{5}, B{5}, A{6}, B{6} • DIMMs must be populated in the order specified. • Requires two ranks or more per channel. Multi rank sparing population order A{1}, B{1}, A{2}, B{2}, A{3}, B{3}, A{4}, B{4}, A{5}, B{5}, A{6}, B{6} • DIMMs must be populated in the order specified. • 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}, A{7, 8, 9, 10, 11, 12}, B{7, 8, 9, 10, 11, 12} Supported with 6 or 12 DIMMs per processor. Quad processor (Starting with processor 1, and processor 1, processor 2, processor 3, and processor 4 population should match) Optimized population order (Independent channel) A{1}, B{1}, C{1}, D{1}, A{2}, B{2}, C{2}, D{2}, A{3}, B{3} C{3}, D{3}, A{4}, B{4} C{4}, D{4} Odd number of DIMM population per processor 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. NOTE: For best performance, 6 DIMMs or 12 DIMMs per processor is recommended. 78 Installing and removing system components

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•
Quad processor: Populate the slots in round robin sequence starting with processor 1.
NOTE:
Processor 1, processor 2, processor 3, and processor 4 population should match.
Table 15. 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},
A{4}, B{4},
A{5}, B{5},
A{6}, B{6}
Odd number of DIMM population per processor 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.
NOTE:
For best performance, 6 DIMMs or
12 DIMMs per processor is recommended.
Optimizer population order is not traditional for 8
and 16 DIMMs installations for dual processor.
•
For 8 DIMMs: A1, A2, A4, A5, B1, B2, B4, B5
•
For 16 DIMMs:
A1, A2, A4, A5, A7, A8, A10, A11
B1, B2, B4, B5, B7, B8, B10, B11
Mirroring population order
A{1, 2, 3, 4, 5, 6},
B{1, 2, 3, 4, 5, 6},
A{7, 8, 9, 10, 11, 12},
B{7, 8, 9, 10, 11, 12}
Mirroring is supported with 6 or 12 DIMMs per
processor.
Single rank sparing
population order
A{1}, B{1},
A{2}, B{2},
A{3}, B{3},
A{4}, B{4},
A{5}, B{5},
A{6}, B{6}
•
DIMMs must be populated in the order
specified.
•
Requires two ranks or more per channel.
Multi rank sparing
population order
A{1}, B{1},
A{2}, B{2},
A{3}, B{3},
A{4}, B{4},
A{5}, B{5},
A{6}, B{6}
•
DIMMs must be populated in the order
specified.
•
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},
A{7, 8, 9, 10, 11, 12},
B{7, 8, 9, 10, 11, 12}
Supported with 6 or 12 DIMMs per processor.
Quad processor
(Starting with
processor 1, and
processor 1, processor
2, processor 3, and
processor 4 population
should match)
Optimized population order
(Independent channel)
A{1}, B{1}, C{1}, D{1},
A{2}, B{2}, C{2}, D{2},
A{3}, B{3} C{3}, D{3},
A{4}, B{4} C{4}, D{4}
Odd number of DIMM population per processor 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.
NOTE:
For best performance, 6 DIMMs or
12 DIMMs per processor is recommended.
78
Installing and removing system components