Is this Mac G5 the Xbox 360 dev environment box?

Of course, as usual we can't speak to the validity of the photos in question (we wouldn't be doing our job if weren't at least a little skeptical), but might these be the Mac G5s being used for the Xbox 360/Xbox 2's dev environment kit? As you may recall, the console is supposed to be running a tri-core version of IBM's PowerPC processor, and the G5 in question here is also supposedly equipped with that ATI R420-based adapter and a paltry 512MB of RAM. Real or not, some stickers slapped on a G5 is still not nearly as impressive as that Sony PSP dev system we saw before.

[Thanks, MaZo]