Dell PowerEdge XE2420 EMC Installation and Service Manual - Page 105

Table 41. Memory population rules continued, Table 42. Optimized population rules for single processor

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Table 41. Memory population rules (continued) Processor Configuration Memory population starting with processor1) Memory population information ● 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 8 and 14 DIMM installations of dual processor. ○ For 8 DIMMs: A1, A2, A4, A5, B1, B2, B4, B5 ○ For 14 DIMMs: A1, A2, A4, A5, A7, A8, A9, A10, B1, B2, B3, B4, B5, B6 Mirroring population order Single rank sparing population order Multi rank sparing population order A{1, 2, 3, 4, 5, 6}, B{1, 2, 3, 4, 5, 6} A{1}, B{1}, A{2}, B{2}, A{3}, B{3}... A{1}, B{1}, A{2}, B{2}, A{3}, B{3}... Mirroring is supported with 6 DIMM slots per processor. Populate in this order, odd amount per processor allowed. Requires two ranks or more per channel. Populate in this order, odd amount per processor allowed. Requires three ranks or more per channel. Table 42. Optimized population rules for single processor Single processor A1 A2 A3 A4 A5 1 DIMM ✔ - - - - 2 DIMMs ✔ ✔ - - - 3 DIMMs ✔ ✔ ✔ - - 4 DIMMs (Exception from ✔ ✔ - ✔ ✔ traditional rules) 5 DIMMs ✔ ✔ ✔ ✔ ✔ 6 DIMMs (Recommended ✔ ✔ ✔ ✔ ✔ for best performance) 7 DIMMs ✔ ✔ ✔ ✔ ✔ 8 DIMMs (Exception from ✔ ✔ - ✔ ✔ traditional rules) 9 DIMMs ✔ ✔ ✔ ✔ ✔ 10 DIMMs ✔ ✔ ✔ ✔ ✔ A6 - - - - - ✔ ✔ - ✔ ✔ A7 - - - - - - ✔ ✔ ✔ ✔ A8 - - - - - - - ✔ ✔ ✔ A9 - - - - - - - ✔ ✔ ✔ A10 - - - - - - - ✔ - ✔ Installing and removing system components 105

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Table 41. Memory population rules (continued)
Processor
Configuration
Memory population
Memory population information
starting with
processor1)
●
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 8 and 14
DIMM installations of dual
processor.
○
For 8 DIMMs: A1, A2, A4,
A5, B1, B2, B4, B5
○
For 14 DIMMs: A1, A2, A4,
A5, A7, A8, A9, A10, B1, B2,
B3, B4, B5, B6
Mirroring population order
A{1, 2, 3, 4, 5, 6}, B{1, 2, 3, 4,
5, 6}
Mirroring is supported with 6
DIMM slots 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 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
three ranks or more per channel.
Table 42. Optimized population rules for single processor
Single processor
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
1 DIMM
✔
–
–
–
–
–
–
–
–
–
2 DIMMs
✔
✔
–
–
–
–
–
–
–
–
3 DIMMs
✔
✔
✔
–
–
–
–
–
–
–
4 DIMMs (Exception from
traditional rules)
✔
✔
–
✔
✔
–
–
–
–
–
5 DIMMs
✔
✔
✔
✔
✔
–
–
–
–
–
6 DIMMs (Recommended
for best performance)
✔
✔
✔
✔
✔
✔
–
–
–
–
7 DIMMs
✔
✔
✔
✔
✔
✔
✔
–
–
–
8 DIMMs (Exception from
traditional rules)
✔
✔
–
✔
✔
–
✔
✔
✔
✔
9 DIMMs
✔
✔
✔
✔
✔
✔
✔
✔
✔
–
10 DIMMs
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
Installing and removing system components
105