I'm in the process of building a new server and I have a decision to make: Do I install 32-bit or 64-bit Linux (well do I stick with the 64-bit version I've already installed). I've poke about on the interweb but haven't found anything to sway me one way or the other.

Here is what the server will be doing: DHCP, DNS, Samba PDC, SVN server, internal web server running a few PHP pages all tied to a MySQL database, and SugarCRM (again more PHP, and MySQL). X-windows get started rarely (the owner of the company likes to do things for himself sometimes and prefers the GUI).

Hardware: Opteron w/2GB RAM, 3ware Raid controller, and a bunch of disks. At Some Point in the Future(TM) I may add a second processor and more RAM, probably no more than an additional 2GB.

Is there any advantage or dis-advantage to running 64-bit? This server will never see more than 4GB of RAM. I can almost guarantee it. Expected life of the server is 3 years. CentOS is the OS-flavor of choice.

Comments? Suggestions?

Thanks,
Garl
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