X8440 Dual or Single Channel DIMM Options

You can configure the X8440 Server Module processor to (1) behave as a single dual-channel DRAM Controller (DCT); known as ganged mode; or (2) to behave as two single-channel DCT; known as unganged mode.

In an unganged mode configuration, a DIMM operates independently as a 64-bit interface. In a ganged mode configuration, two identical DIMMs operate in parallel to create a 128-bit interface.

By default, all DIMMs on the X8440 Server Module are populated in identical pairs and operate as a dual-channel 128 bit interface. If required, you can configure the X8440 processor to support an unganged mode configuration, where each DIMM operates independently as a 64-bit interface. For more information on how to enable or disable ganged or unganged mode configurations, see Enable or Disable X8440 Ganged or Unganged DIMM Modes.

Note

When unganged mode is enabled on an X8440 Server Module, the processor performance might be enhanced but the RAS feature for 4- bit ECC (error checking and correcting) is no longer supported.

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