Enabling 3GB switch on Windows Vista™ or Windows 7

Published date: 2010-May-27 ID: TS1069947 Applies to: AutoCAD® 2011 AutoCAD® 2010 AutoCAD® 2009 AutoCAD® 2008 AutoCAD® Architecture 2011 AutoCAD® Architecture 2010 AutoCAD® Architecture 2009 AutoCAD® Architecture 2008 AutoCAD® Civil 3D® 2011 AutoCAD® Civil 3D® 2010 AutoCAD® Civil 3D® 2009 AutoCAD® Civil 3D® 2008 AutoCAD® Electrical 2011 AutoCAD® Electrical 2010 AutoCAD® Electrical 2009 AutoCAD® Electrical 2008 AutoCAD® Inventor® Professional Suite 2011 AutoCAD® Inventor® Professional Suite 2010 Autodesk® Inventor™ Professional 2009 Autodesk® Inventor™ Professional 2008 AutoCAD® Inventor® Suite 2011 AutoCAD® Inventor® Suite 2010 Autodesk® Inventor™ Suite 2009 Autodesk® Inventor™ Suite 2008 AutoCAD® Land Desktop 2009 AutoCAD® Land Desktop 2008 AutoCAD® Map 3D 2011 AutoCAD® Map 3D 2010 AutoCAD® Map 3D 2009 AutoCAD® Map 3D 2008 AutoCAD® Mechanical 2011 AutoCAD® Mechanical 2010 AutoCAD® Mechanical 2009 AutoCAD® Mechanical 2008 AutoCAD® MEP 2011 AutoCAD® MEP 2010 AutoCAD® MEP 2009 AutoCAD® MEP 2008 AutoCAD® P&ID 2010 AutoCAD® P&ID 2009 AutoCAD® P&ID 2008 AutoCAD® Plant 3D 2009 AutoCAD® Plant 3D 2010 AutoCAD® Revit® MEP Suite 2011 AutoCAD® Revit® MEP Suite 2010 AutoCAD Revit MEP Suite 2009 AutoCAD Revit MEP Suite 2008 Autodesk® Inventor® 2011 Autodesk® Inventor® 2010 Autodesk® Inventor™ 2009 Autodesk® Inventor™ 2008 Autodesk® Revit® Architecture 2011 Autodesk® Revit® Architecture 2010 Revit® Architecture 2009 Revit® Architecture 2008 Autodesk® Revit® Structure 2011 Autodesk® Revit® Structure 2010 Revit® Structure 2009 Revit® Structure 2008 Autodesk® Vault 2009 Autodesk® Vault 2008

You want to enable the 3GB switch on the Windows Vista™ or Windows 7 operating systems.

To enable the 3GB switch on Windows Vista™ or Windows 7:

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 disable 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://msdn.microsoft.com/en-us/library/ff556232.aspx

See also

• The 3GB switch and Revit®
• Revit® and Virtual Memory