In XP professional, you can go into the boot ini file and flip a switch to 3GB, as the default is 2 gig for *any given process*.

As I understand it, you can have 4 gig in the machine and XP pro will recognize it. However only 2 gig is allowed for any application and the operating system reserves the rest. By flipping that switch you can have 3 gig RAM available to applications and the system reserves just one.

From MS site-
Windows XP Professional and Windows Server 2003 Memory Support. The maximum amount of memory that can be supported on Windows XP Professional and Windows Server 2003 is also 4 GB.
http://www.microsoft.com/whdc/system/platform/server/PAE/PAEmem.mspx


Make your sound your own!
.. I do not work here, but the benefits are still awesome