SQL SERVER Set Working Set Size

The configuration option Set Working Set Size is a setting from earlier versions, and it has been deprecated. This setting is ignored in SQL Server 2008, even though you do not receive an error message when you try to use this value.  

http://www.mybasicknowledge.com/2012/09/sql-server-database-options-and.html

http://www.mybasicknowledge.com/2012/09/using-windows-system-monitor-for-sql.html