Just a day ago, while installing SQL Server on our development machine Jr. DBA asked me what should be kept file growth of the TempDB. I really have not thought about this till moment and I looked at MS site.
I found following answer and I think it is quite interesting.
tempdb file size – FILEGROWTH increment for tempdb
0 to 100 MB – 10 MB
100 to 200 MB – 20 MB
500 or more – 10%
Initially you can not know what will be the final size of your TempDB, but as you continue using server for a while and can detect what is the size of the TempDB. Based on your size of TempDB ideal size of FILEGROWTH can be determined.