SQL : Move TempDB
The following transact-SQL will move the tempdb data and log files to a different physical loation. Simply modify the FILENAME paths to suit, adding additional files where appropriate for your environment.
USE master
GO
ALTER DATABASE tempdb
MODIFY FILE (NAME = tempdev, FILENAME = ‘N:\Data\tempdb.mdf’)
GO
ALTER DATABASE tempdb
MODIFY FILE (NAME = templog, FILENAME = ‘N:\Data\tempdb.ldf’)
GO
After completing this you will need to take the SQL instance offline and bring it back onlin.