Bhuvnesh (12/3/2012)
and task manager can give you estimated value for sqlserver.exe
No, Task manager gives exact values, not estimated. It can be wrong because it doesn't count memory allocated via the AWE mechanism which is used when SQL has the locked pages in memory privilege.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability