In this day and age of Windows Vista, 64 Bit Operating Systems, and unlimited RAM utilization capabilities (fheww that was a couple of big words there) and Revit file size inflation, what happens to the little guys who still function using that age old fabled Windows XP or, heaven forbid, Windows... dare I say it?
...2000 or Me?
There I said it.
With our 4Gb of RAM slots but with only the 2Gb that the cotton-picken software will let us utilize and with file sizes inflating by the minute, no second, and programs requiring more and more RAM everytime we blink our eyes, it seems there's some sort of bail-out needed here.
Now, of course we can always install a 64bit OS on our 32bit machines but what's the point? 2 Gigs is 2 Gigs no matter what bit OS your working on if your still on a 32bit machine. But let's say you don't want to go out and buy that 64bit machine just yet and bask in the sweet, triumphant glow of unlmited RAM capabilites.
There's one more last ditch effort available, one "last line of defense" if you will...
The 3GB Switch...
dun dun dun... ...corney? Yeah I know.
The 3Gb switch will unlock that previously unreachable 3rd Gig of RAM for your computable gratification:
*This is and exerpt from guidelines and instructions published by Autodesk. For more information regarding the 3Gb Switch and Revit, visit the Autodesk website and search "The 3Gb Switch and Revit"
Before You Enable the 3GB Switch
You will need to verify that the paging file size is optimized for your system. The paging file should at least be the size that is recommended for Windows and at most the size should be two times the amount of installed RAM. Follow these steps:
1. On the Start menu (Windows), click Settings > Control Panel.
2. In Control Panel, double-click System.
3. In the System Properties dialog box, click the Advanced tab.
4. Under Performance, click Settings.
5. In the Performance Options dialog box, click the Advanced tab.
6. On the Advanced tab, under Virtual Memory, click Change.
7. I n the Virtual Memory dialog box, change the Initial and Max values to 4092 (2 * 2GB) for a 2GB machine.
8. Click Set.
9. Click OK to close each dialog box.
Enabling the 3GB Switch
1. Right-click My Computer. Click Properties.
2. In the System Properties dialog box, click the Advanced tab.
3. On the Advanced tab, under Startup and Recovery, click Settings.
4. In the Startup and Recovery dialog box, under System startup, click Edit. The Windows boot.ini file will be opened in Notepad.
5. 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.
6. Highlight the following line in the boot.ini file:
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
7. 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.
8. 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 /fastdetect
9. Save the boot.ini file and close Notepad.
10. Click OK to close each dialog box.
11. Reboot your computer.
12. 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.