Execute the following Microsoft SQL Server T-SQL database administration scripts in SSMS Query Editor to move the tempdb files into a new location:

-- Moving tempdb to a new location - Checkout current location and logical names

USE tempdb

GO

EXEC sp_helpfile

GO

-- Setup the new location

USE master

GO

ALTER DATABASE tempdb

      MODIFY FILE (NAME = tempdev, FILENAME = 'd:\sql\db\tempdb\tempdb.mdf')

GO

ALTER DATABASE tempdb

      MODIFY FILE (NAME = templog, FILENAME = 'd:\sql\db\tempdb\tempdb.ldf')

GO

/*

Messages:

The file "tempdev" has been modified in the system catalog. The new path will be used the next time the database is started.

The file "templog" has been modified in the system catalog. The new path will be used the next time the database is started.

*/

-- Reboot server

-- After reboot, old tempdb files can be deleted

Related article:

Moving System Databases