MY site has like 1000 concurrent users at some times, and it's running on a Xeon 3060 (dual Conroe-based CPU) with 4GB on RAM.
I've seen that a dual core CPU is more than enough for the time being, but I ran with 2GB of RAM and found out it was too little for peak moments.
My advise is: don't rush to a Quad CPU yet, look closely at your ram use, because once the server starts swapping it all breaks apart and you'll find yourself restarting the services to restore the site.
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