In the spirit of cooperation and equality, I shall at least link to this article that talks about the Intel Xeon chips paired together in the V8 machine. The Intel Xeon chip was also in the Mac Pro I mentioned in this article.
It's slightly interesting to note the level of detail given in at Hot Hardware as opposed to what appeared at Apple's site regarding their machine, although that is the difference of the audience of each. We geeks love our details, even if we don't necessarily understand them all. (Of course, we would never admit this out loud.)