Dell EMC PowerEdge R7425 Installation and Service Manual

Mode-specific guidelines

The configurations allowed depend on the memory mode selected in the System BIOS.

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.

NOTE

Normal DIMM population rule:
- Single processor systems: Slot 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
DIMM population changed when Performance Optimized Mode is ordered and there is a quantity of 4 or 8 DIMMs per processor.
- With DIMM quantity of 4, the population with 1 processor is slot 1, 3, 5, 7
  - Dual processor system: Processor 2 population must match Processor 1 population.
- With DIMM quantity of 8, the population with 1 processor is slot 1, 2, 3, 4, 5, 6, 7, 8
  - Dual processor system: Processor 2 population must match Processor 1 population.

Table 1. Memory population rulesThis table describes the 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, 11, 12, 13, 14, 15, 16	Populate in this order, odd amount of DIMMs per processor is allowed.
Dual processor (Start with processor 1. Processor 1 and processor 2 population should match)	Optimized (Independent channel) population order	C1{1}, C2{1}, C1{2}, C2{2}, C1{3}, C2{3}...	Odd number of DIMM population per processor is allowed.

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Dell EMC PowerEdge R7425 Installation and Service Manual

Mode-specific guidelines

Optimizer Mode

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