You don't have the hardware yet? That makes a test run difficult. How about borrowing a state-of-the-art server from your IT-dept for a test installation? The problem with other people's figures is that they are not yours! The docs have all necessary information for benchmarking, tuning, etc.
You could also oursource the job, to a Moodle-Partner for example.
Hardware and performance
Server Requirements for large Moodle Deployment up to 40k users with500 concurrent scalable to 4000 concurent
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