That looks like a really nice system as well.

One thing to note, the Gabu system is 1/2 depth, letting you put 14 GPUs in 8U of a standard 4 post rack (or you could use 2 two post racks).



This really only matters if you want to maximize your density and have control over your space (or are in a space without cold isle/hot isle separation, pretty common in a lot of locations). If you had control of your space you could have 2 cold isles and have a warm vent directly out the top.

Also, I would want to test the thermals on the 4U system. It looks like it will be very hard to push a large volume of air through the back of that system once two power supplies are installed (even with six 120mm fans).

The Gabu system has six 140mm fans and lets the GPUs vent directly out the back of the chassis. This conforms with standard GPU designs and should greatly increase airflow.

In all cases its really hard to say what will happen without comparative testing.

Would this 7GPU, 8U rack mount chassis work for your application?

http://www.gabusystems.com/gs-cube/

http://www.gabusystems.com/prototype-build/