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Starting with GMS 8.1, GMS is available in a 64-bit version. Using the 64-bit version, as opposed to the 32-bit version, has the following differences:

  • GMS can access more RAM so larger models can be created
  • A 64-bit version of MODFLOW is included and can be used by changing an option in the Preferences dialog
  • ArcObjects is not available because ESRI has not created a 64-bit version