Dell PowerEdge R730xd Owner's Manual

General memory module installation guidelines

NOTE: Memory configurations that fail to observe these guidelines can prevent your system from booting, stop responding during memory configuration, or operating with reduced memory.

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:

  • RDIMMs and LRDIMMs must not be mixed.
  • x4 and x8 DRAM based memory modules can be mixed. For more information, see the Mode-specific guidelines section.
  • Up to three dual- or single-rank RDIMMs can be populated per channel.
  • Up to three LRDIMMs can be populated per channel regardless of rank count.
  • If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s) or slower depending on system DIMM configuration.
  • Populate memory module sockets only if a processor is installed. For single-processor systems, sockets A1 to A12 are available. For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 are available.
  • Populate all the sockets with white release tabs first, followed by the black release tabs, and then the green release tabs.
  • When mixing memory modules with different capacities, populate the sockets with memory modules with highest capacity first. For example, if you want to mix 4 GB and 8 GB memory modules, populate 8 GB memory modules in the sockets with white release tabs and 4 GB memory modules in the sockets with black release tabs.
  • In a dual-processor configuration, the memory configuration for each processor should be identical. For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
  • Memory modules of different capacities can be mixed provided other memory population rules are followed (for example, 4 GB and 8 GB memory modules can be mixed).
  • Mixing of more than two memory module capacities in a system is not supported.
  • Populate four memory modules per processor (one DIMM per channel) at a time to maximize performance.

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