Task 3: Determine CPU Requirements
A 32-bit server running the standard edition of Windows Server 2008 can only address 4 GB of RAM. If there is an expected need to grow the RAM in a server beyond 4 GB, then move to a 64-bit architecture. By moving to a 64-bit version of Windows Server 2008, future expandability of the system is protected as well as future proofing the hardware from future market decisions around 32-bit.
The general recommendation is that for sites with less than 500 users, start with a single CPU; for sites with less than 10,000 users, start with dual CPUs and then scale from there. This assumes that the primary work of the directory is user authentication.
If the servers handle additional requests, such as Exchange Server, ...
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