I want to get spec server for sql server + client

I want to know spec of server for SQL Server and client connected about :
1. 30 client
2. 50 client
3. 80 client

Thank you.

Your question is unclear. The specifications for SQL Server are the same regardless of the number of users.

SQL Server 2005 Features, Version Comparison
http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx

Perhaps you are attempting to find out pricing? (If so, this in not the correct place to do that.)

|||We really need more information about your workload in order to make hardware recommendations.