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.