Well I've got my new Dell 1850 with Dual 64 bit Xeons. Now the big question? 32 bit or 64 bit? I don't want to limit my options tomarrow by using yesterdays OS. Oh yeah, my Buddy and I are leaning towards CentOS 64 disto.
CentOS is a decent distribution. It should be noted that you should be using the ia32e (EMT64) kernel rather than the x86_64 kernel if you're going down the CentOS 3.x route. I'm not too sure about Centos 4, though.
i m not having information about that OS you have mentioned (centOS) but can say this much if ur having 64 bit processor u should install 64 bit OS on it to make the proper utilization of resources and better performance