We also want to future proof our cooling system. Going with more than 2U gives us extra headroom on cooling. Who knows what the thermal density of the next ASIC will be? 3-4U also allows us 120mm fans which are more energy efficient and quieter.
Power supplies will be internal, included, and upgradeable via a new PDB(power distribution board). (see above photos)
-Nathan
Dayum.. although I do get the 120mm fan concept, not sure about quietness, its in a datacenter right? Who cares how loud it is.
For me, only way I would justify a 4U box would be if it was 2x as powerful as a 2U box.
But if you can get 6TH or more out of a watercooled 1U box then thats fine for me