Dell PowerEdge MX840c EMC PowerEdge MX840c Installation and Service Manual - Page 86
Optimizer Mode, Table 14. Memory population rules
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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. ● 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 14. Memory population rules Processor Configuration Memory population 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} Quad processor (Starting with processor 1, and processor 1, 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} 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} 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} 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} Optimized population order (Independent channel) A{1}, B{1}, C{1}, D{1}, A{2}, B{2}, C{2}, D{2}, 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. ● DIMMs must be populated in the order specified. ● Requires two ranks or more per channel. ● DIMMs must be populated in the order specified. ● Requires three ranks or more per channel. Supported with 6 or 12 DIMMs per processor. Odd number of DIMM population per processor is allowed. 86 Installing and removing sled components
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