I am sure you could post a link to DELL's site with the specs. That should not violate and copyrights since you are not hosting the content, just a link to the content.
course to be safe, ask DELL.
I am sure that alot of RS members would love to know the EXACT hardware B.O.M. (Build Of Materials) their server has so that should they get into a "kernel tweaking mode" they have a list they can use to assist them.
I mean.. if you have a rack mount system, even a tower, I am sure USB support is not needed..