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DRAM DIMM installation order

Follow the instructions in this section to install DRAM DIMMs properly.

  • Independent memory mode
    In independent memory mode, memory channels can be populated with DIMMs in any order. All channels for each processor can be populated in any order with no matching requirements. Independent memory mode provides the highest level of memory performance but lacks failover protection. The DIMM installation order for the independent memory mode varies based on the number of processors and memory modules installed in the server.
  • Memory mirroring mode
    Memory-mirroring mode provides full memory redundancy while reducing the total system memory capacity in half. Memory channels are grouped in pairs with each channel receiving the same data. If a failure occurs, the memory controller switches from the DIMMs on the primary channel to the DIMMs on the backup channel. The DIMM installation order for memory mirroring varies based on the number of processors and DIMMs installed in the server.