TempDB Contention with 24 physical tempdb files on 48 core AMD Opteron box
Trace flag 1118 forces uniform extent allocations instead of mixed page allocations.   The trace flag is commonly used to assist in TEMPDB scalability by avoiding SGAM and other allocation contention points. If you have SQL Server 2008 or SQL Server 2005 and the fix applied and are still encountering TEMPDB contention consider trace flag 1118 for further assistance in resolving the contention.