Dell VxRail P670F, P670N, V670F, and S670 Installation and Service Manual

The system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset architectural configuration. The following are the recommended guidelines for installing memory modules:

• All DIMMs must be DDR4.
• x4 and x8 DRAM-based memory modules can be mixed.
• If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).
• Populate memory module sockets only if a processor is installed. For dual-processor systems, sockets A1 to A16 and sockets B1 to B16 are available.
• In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory performance.
• The following table describes the memory population rules:

  Table 1. Memory population rulesMemory population rules

  Processor	Configuration	Memory population	Memory population information
  Dual processor (Start with processor1. Processor 1 and processor 2 population should match)	Optimizer (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}, A{7}, B{7} A{8}, B{8}, A{9}, B{9}, A{10}, B{10}, A{11}, B{11}, A{12}, B{12}, A{13}, B{13}, A{14}, B{14}, A{15}, B{15}, A{16}, B{16}	2, 4, 8, 12, 16, 24 and 32 DIMMs are supported per system. Optimizer population order is not traditional for 8 and 16 DIMMs installations for dual processor.

• Populate all the sockets with white release tabs first, followed by the black release tabs.
• Memory modules of different capacities can be mixed provided other memory population rules are followed.
• Unbalanced or odd memory configuration results in a performance loss and system may not identify the memory modules being installed, so always populate memory channels identically with equal DIMMs for best performance.
• Supported RDIMM/LRDIMM configurations are 4, 8, 16, and 32 DIMMs per system.