Tom's Hardware Guide published a review on Origin PC Chronos: Two GeForce GTX 780 Tis In A Mini Gaming Cube A quote from the article:

Even as mini-ITX cases appear to be getting bigger, microATX is getting smaller. The Rodney Dangerfield of form factors, microATX is often ridiculed by enthusiasts who just can't get enough room for high-end hardware and skipped over entirely by the crowd shopping for ever-shrinking form factors. The brief window of opportunity that microATX gaming cubes had to impress with their diminutive dimensions is all but forgotten, lost to the din made over slim little boxes housing GeForce GTX Titan cards.

But as anyone who built a PC using a cube-shaped enclosure will tell you, that probably shouldn’t have happened. The microATX form factor gives us four slots of expansion, enough room for at least four DIMMs, and space around the processor interface for an enthusiast-class voltage regulator. That’s because the ATX-sized upper portion of the motherboard remains, even after a microATX's platform's three bottom slots are trimmed off.

 Origin PC Chronos: Two GeForce GTX 780 Tis In A Mini Gaming Cube @ Toms Hardware