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Enabling 3GB switch on Windows Vista™

Published date: 2007-Sep-25
ID: TS1069947

Applies to:
AutoCAD® 2009
AutoCAD® 2008
AutoCAD® Civil 3D® 2008
Autodesk® Inventor™ Professional 2008
Autodesk® Inventor™ Suite 2008
AutoCAD® Land Desktop 2008
AutoCAD® MEP 2008
AutoCAD Revit MEP Suite 2008
Autodesk® Inventor™ 2008
Autodesk® Productstream™ 2008
Revit® Architecture 2008
Revit® Structure 2008
Autodesk® Vault 2009
Autodesk® Vault 2008

Issue

You want to enable the 3GB switch on the Windows Vista™ operating system.

Solution

To enable the 3GB switch on Windows Vista™

  1. Right-click Command Prompt in the Accessories program group of the Start menu. Click Run as Administrator.
  2. At the command prompt, enter "bcdedit /set IncreaseUserVa 3072"
  3. Restart the computer.

To turn off the 3GB switch

  1. Right-click on Command Prompt in the Accessories program group of the Start menu. Click Run as Administrator.
  2. At the command prompt, enter "bcdedit /deletevalue IncreaseUserVa"
  3. Restart the computer.

For more information on the 3GB switch, refer to the following Microsoft MSDN article:

http://msdn2.microsoft.com/en-us/library/ms791558.aspx

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