3gb Memory Fix

32bit processors and operating systems have a limitation of 3GB.   Programs are limited to 2GB of RAM.  These tweaks increase the OS’s ability to recognize more RAM and increase the ceiling for programs that can recognize more than 2GB of RAM.  (Above 3 GB, all memory may not be available due to system resource requirements. The memory above 3 GB is used for PCI I/O and other system resources. )

Tweaks can be dangerous if you don’t check everything twice!

http://www.microsoft.com/whdc/system/platform/server/PAE/PAEmem.mspx <- Reference

To get more from Windows XP, you have to modify your Boot.ini file.  You have to be familiar with windows explorer.  (You must show hidden and system files.  If the boot.ini file is read only, uncheck it to make changes.

Windows XP

[boot loader]
default=multi(0)disk(0)rdisk(0)partition(1)\WINNT   <-yours may be different!
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINNT=”Windows XP Professional” /PAE /3GB  <-add this

The /3gb switch allows programs written specifically to use more than 2gb of ram.

Windows XP Sample

Windows Vista and 7

To add to Vista’s and 7’s boot process, from a cmd line (you must run the cmd line as an administrator)-

In Vista, To get programs written for more than 2gb of ram:
BCDEDIT /Set IncreaseUserVa 3072

Note: In Vista, you can type BCDEDIT and hit enter to see the PAE  and UserVA settings

Vista Sample


About TCAT Shelbyville IT Department

The Tennessee College of Applied Technology - is one of 46 institutions in the Tennessee Board of Regents System, the seventh largest system of higher education in the nation. This system comprises six universities, fourteen community colleges, and twenty-six Applied Technology Colleges.
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