CAD tip # 5551:

Question CAD
% platform category

Enabling the /3GB mode in Windows Vista.

If you get a "not enough memory", "out of memory", "low memory" or a similar type of RAM error in a Windows Vista application...

Windows Vista no longer uses the BOOT.INI file, so there is a different method for setting the "3GB" switch which enables to use 3GB of RAM for applications in 32-bit Windows (otherwise they use just 2GB - maximum).

If you want to make accessible 3GB RAM for your CAD applications in Windows Vista, use the BCDedit.exe tool (Boot Configuration Data Editor). The 3GB memory mode can be enabled with the command:

bcdedit /set IncreaseUserVa 3072

and disabled by the command:

bcdedit /deletevalue IncreaseUserVa

Run this command from a command window with Administrator priviledge - i.e. (in the Start menu) type CMD and press Ctrl+Shift+Enter, or select "Command Prompt" (Accessories), right-click on it and choose "Run as Administrator".

Restart your PC after this change.

ACADInventorRevitADTCivil

Vista,Win7 CAD,HP

6.5.2007 66278x FAQ

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applies to: AutoCAD · Inventor · Revit · AutoCAD Architecture · AutoCAD Civil 3D ·

See also:
Tip 6617:	Error AcMapCoordinateTransform.cpp when inserting an image.
Tip 6564:	AutoCAD reports FATAL ERROR: Out of memory - shutting down
Tip 5948:	Maximum addressable memory in the individual Windows versions.
Tip 4503:	How to find whether Inventor is running in the extended /3GB memory mode?
Tip 2731:	How to increase memory available for Inventor above 2GB?

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