Hi Lynn

For a start I am no expert on these things.

I couldn't find anything overly specific regarding this, however given the amount of times I saw that using the /3GB switch restricts the use of AWE to 16GB as there is only 1GB of kernal memory available for mapping, it would seem the 2GB requirement may be correct.

Here's some of pages I looked at:

http://en.wikipedia.org/wiki/Address_Windowing_Extensions

http://technet.microsoft.com/en-us/library/ms175581.aspx

http://blogs.msdn.com/b/psssql/archive/2012/12/11/how-it-works-sql-server-32-bit-pae-awe-on-sql-2005-2008-and-2008-r2-not-using-as-much-ram-as-expected.aspx