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Dell PowerEdge R750 Installation and Service Manual

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General memory module installation guidelines

To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory. If your system's memory configurations fail to observe these guidelines, your system might not boot, stop responding during memory configuration, or operate with reduced memory.

The memory bus may operate at speeds of 3200 MT/s, 2933 MT/s depending on the following factors:

  • System profile selected (for example, Performance Optimized, or Custom [can be run at high speed or lower])
  • Maximum supported DIMM speed of the processors
  • Maximum supported speed of the DIMMs
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
NOTE:Fault Resilient Memory-Non Uniform Memory Access is supported.

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 single-processor systems, sockets A1 to A16 are available.
    • 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.
    Table 1. Memory population rulesThe below tables describes the memory population information.
    Processor Configuration Memory population Memory population information
    Single processor Optimizer (Independent channel) population order A{1}, A{2}, A{3}, A{4}, A{5}, A{6}, A{7}, A{8}, A{9}, A{10}, A{11}, A{12}, A{13}, A{14}, A{15}, A{16} 1, 2, 4, 6, 8, 12 or 16 DIMMs are allowed.
    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.
    NOTE: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.
  • Only RDIMM Memory modules of different capacities can be mixed provided other memory population rules are followed.
    NOTE:For example, 8 GB and 16 GB memory modules can be mixed.
  • Mixing of more than two memory module capacities in a system is not supported.
  • 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 1, 2, 4, 6, 8, 12, or 16 DIMMs per processor.

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