Michael Valentine Jones (5/27/2011)
Paul Randal address the whole tempdb data file per processor core story here:A SQL Server DBA myth a day: (12/30) tempdb should always have one data file per processor core
Been there, done that. It's one of many, many articles out there on this subject.
The truth is, just about every database server can benefit from a few TempDb data files. How many? How big? On different LUNs or disks?
It all depends. You have to experiment.
LC