Very impressive, but I don't know if I'd call that one 5K PPD "box." It's in one case, but the two systems are only connected via a standard network interface as far as I can tell. Anyone can build one of those. Correct me if I'm wrong.
I imagine it's more for space, two complete systems in a 1U enclosure should provide significant space savings and rack density can sometimes be as important as performance per watt depending on the data center.
Are those 12 stacked 40mm fans in there? Holy smokes, a rack of those will make you go deaf in about 1.3 seconds.
See if you enter the zim dimension anything is possible. The Internet is actually just an off shoot of zims left nut in this parallel universe. Moose reigns as all mighty in said universe with unhappy_mage standing on the corner telling jokes, punny joke, on the street corner.
Opps, I think I just mixed 2.5 parallel universes...