Dell PowerEdge R320 Systems Owner's Manual

General Memory Module Installation Guidelines

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

This 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 best performance:

  • UDIMMs and RDIMMs must not be mixed.
  • x4 and x8 DRAM based DIMMs can be mixed. For more information, see Mode-Specific Guidelines.
  • A maximum of two UDIMMs can be populated in a channel.
  • A maximum of two single- or dual-rank RDIMMs can be populated in a channel.
  • Populate all sockets with white release tabs first, and then black.
  • Populate the sockets by highest rank count in the following order - first in sockets with white release levers, and then black. For example, if you want to mix quad-rank and dual-rank DIMMs, populate quad-rank DIMMs in the sockets with white release tabs and dual-rank DIMMs in the sockets with black release tabs.
  • Memory modules of different sizes can be mixed provided that other memory population rules are followed (for example, 2 GB and 4 GB memory modules can be mixed).
  • Depending on mode-specific guidelines, populate two or three DIMMs per processor (one DIMM per channel) at a time to maximize performance. For more information, see Mode-Specific Guidelines.
  • 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.

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