ARC is audio return channel or something, just a port with an extra feature of being able to send sounds out from the TV to something like an av receiver/amp. Just gives you the extra feature if you have something like that connected, otherwise it just works as a normal hdmi port.
So plug the xbox's in to whichever port you want

---------- Post added at 13:36 ---------- Previous post was at 13:34 ----------
Quote:
Originally Posted by Hom3r
I guess the HDMI DVI port is video only?
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I'm 80% sure on my samsung tv I have got sound through that port before but wont be able to check for sure until I get home later. It will probably depend on your pc's graphics card and internal connections as to if it will work.