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I would rather looking for tool where by giving info like no of concurrnet session and max no of paging access etc shall give the appropriate no of CPU and memory with the relevent models of server.
There are several sizers available from http://www.hp.com/servers/activeanswers for specific applications like Oracle, SQL Server, Exchange, Citrix and VMware ESX.
You can pick up a copy of Mathematical Server Sizing software at SourceForge. Here's a link. Check the project documentation and the IEEE article for descriptions of tool usage and the theory behind the technique. Here's a link.