Please don’t put 1.5 time of Physical memory.
Less amount is better for SQL server if you have a x64 machine and enough physical memory.
http://support.microsoft.com/kb/889654/en-us
http://blogs.msdn.com/b/buckwoody/archive/2010/06/29/the-windows-page-file-and-sql-server.aspx
http://www.brentozar.com/archive/2009/11/christian-bolton-on-sql-server-memory/
http://blogs.technet.com/b/askperf/archive/2007/12/14/what-is-the-page-file-for-anyway.aspx
http://www.brentozar.com/archive/2008/03/sql-server-2005-setup-checklist-part-1-before-the-install/
Simon's SQL 