5+1? That's a very unusual RAID type. Don't think it would be that good for TempDB, 10 would be better, 5+1 would still have the write overhead from the parity stripe, just like plain RAID 5.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability