Game Servers - CS etc.

I am in the process of determining the requirements for setting-up dedicated servers and hosting for the following games:

1) Counter Strike
2) Battlefield 1942
3) Call of Duty
4) Unreal Tournament 2004
5) Wolfenstein - Return to Castle

As per my knowledge we require about 2 or 3 servers with specs as given below to host these games - please let me know if this is correct as I am about to place orders for these servers.

Dual Xeon 2.8 GHz -                                                      
2x  73 GB SCSI HHD Ultra 320 15k
2x  Power Supplies
4096 MB RAM ECC Registered -                                                              
Operating System:  Red Hat Enterprise Linux, Version 3


Also, I have been told that these servers will be able to host roughly 500-600 users that should translate to about 50 servers on each machine. Finally, I am looking into a bandwidth package of 5 Mbps.

Please let me know how you rate these specifications and what suggestions you might have on them.

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