3G Switch- Enabling the 3G RAM Switch- If your machine has 4GB of RAM
Right-click My Computer. Click Properties.
In the System Properties dialog box, click the Advanced tab.
On the Advanced tab, under Startup and Recovery, click Settings.
In the Startup and Recovery dialog box, under System startup, click Edit.
The Windows boot.ini file will be opened in Notepad.
Save a renamed copy of your boot.ini file somewhere on your computer in
case you need to revert back to your original version of the file.
Note: Boot.ini files may be different from computer to computer.
Highlight the following line in the boot.ini file :
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS=”Microsoft Windows XP Professional”
-Copy (Ctrl-C) and paste (Ctrl-V) the line just below the original. Note: Your exact text
string may be different from the text string in this document. So be sure to copy the
text string from your boot.ini file, not the text string shown here.
-Modify the copied line to include “ /3GB”, as shown in the example below. Note: Do
not overwrite any existing lines.
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS=”Microsoft Windows XP Professional
3GB” /3GB /fastdetec
-Save the boot.ini file and close Notepad.
-Click OK to close each dialog box.
-Reboot your computer.
-During startup, select the 3GB option. If you do not select the 3GB option, the system
will default to the 2GB total memory setting.
If there are problems at startup, you may need to update some of your drivers.
Verifying that the 3GB switch is enabled:
Start a Revit session, and then open the new journal text file that was created. The Journals
folder can usually be found in the C:\Program Files\Autodesk Revit Building
X\Journals directory. Note: Revit Building is used as an example. If you are using Revit
Structure, the folder will be named “Revit Structure.” If you are using Revit Systems, the
folder will be named “Revit Systems.” Near the beginning of the journal, check to make sure
that the TotalVirtualMemorySize equals approximately 31456000.