You can't use more than 1GB of RAM for a SQL Server 2005 Express Edition
instance.
It does not matter you take advantage of 3GB or something else...
Check out the following feature comparison table and pick up a convenient
SQL Server edition for your needs.
http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx

Signature
Ekrem Önsoy
> Hello:
> I'm looking for some information regarding the 3 GB switch for SQL Express
[quoted text clipped - 12 lines]
> switch first.
> Many thanks.
RJ - 30 Apr 2008 21:28 GMT
Thanks much. That answered my question--moving the database to a full
version of SQL.

Signature
RJ
> You can't use more than 1GB of RAM for a SQL Server 2005 Express Edition
> instance.
[quoted text clipped - 21 lines]
> > switch first.
> > Many thanks.