Sizing the Database Server for Oracle

Please let me know the parameters which decide the
size of server hosting a database in terms of

CPU speed and number of CPUs 
Memory size (RAM) 
Hard Disk size 

Is there any standard benchmarking in deciding such
parameters at the time of proposal? I have gone
through www.tpc.org (Transaction Processing
Council).They have some standard benchmarking
standards . It is good. But I wanted to know the
Standard configuration for the above mentioned
parameters for which the server can be hosted

Regards,
Satya Prakash

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