AlexMcCo (9/25/2013)
You do not need tempdb ndf file as large as you can make them. It is more than enough to put as 50 mb each. They will expand as much as needed during workload, just do not put hard growth restrictions.
For all the reasons the others have stated, that's just not right. In fact, it's a pretty bad recommendation. TempDB should be sized like any other database so that growth is normally a planned event instead of taking you by surprise when you can least afford it. Correct sizing will also prevent the fragmentation that so many instances suffer.
And, as a bit of a sidebar, if you do have ndf files for temp, they should all be the same initial size and have the same growth settings as the mdf file.
--Jeff Moden
Change is inevitable... Change for the better is not.