Performance tuning in PostgreSQL

Hello everybody,

Can someone tell me the various aspects of Hardware for performance tuning
in PostgreSQL 7.3 on a RHL 8 server.

How can I determine the required hardware configuration(CPUs,RAM,Shared
Buffer Space,OS TCP/IP ports) for n number of connections or n number of
users accessing the database?

Please help.

Thanks,
Best Regards.

Abhishek Sharma,