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CAD tip CAD tip # 5948:

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Q - question

Maximum addressable memory in the individual Windows versions.

A - answer Applications running in standard 32-bit Windows versions can address only 2GB RAM (3GB in a special "/3GB" mode - see tips; the OS memory limit is 4GB). This may seriously limit 3D CAD software applications processing large volumes of data.

Native 64-bit applications (special 64-bit versions) running in 64-bit Windows versions can access much more memory. Maximum addressable RAM limits are following:

  • Windows XP x64: 128 GB
  • Vista Home Basic 64-bit: 8 GB
  • Vista Home Premium 64-bit: 16 GB
  • Vista Business/Ultimate/Enterprise 64-bit: 128 GB
For comparison, 32-bit versions have these limits (OS limit; application limits apply - see above):
  • Windows 3.1x: 256MB (512 MB)
  • Windows 98/Me: 1 GB (512 MB)
  • Windows 2000, NT4: 2 GB (4 GB)
  • Windows XP Starter: 512 MB
  • Windows XP Home, Professional: 4 GB
  • Windows Vista Starter: 1 GB
  • Windows Vista Home, Business, Enterprise, Ultimate 32-bit: 4 GB
100% WinXP,Vista  CAD 
17.1.2008    16286×  
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applies to: AutoCAD · Inventor · 3ds Max ·

See also:
Tip 6617:Error AcMapCoordinateTransform.cpp when inserting an image.
Tip 6564:AutoCAD reports FATAL ERROR: Out of memory - shutting down
Tip 5551:Enabling the /3GB mode in Windows Vista and Win7.
Tip 2731:How to increase memory available for Inventor above 2GB?

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