Given rated 845w total load and 6 boards giving 140w per-board my bet is 1 PCIe power jack per board.
wonder how well it would fit in an old s4 case?
Or the 4U high case from the miner A1 chip Dragon clone, 1.1THs @ 1,300w) that AMT finally sent me 8mo after ordering...
If you are on about rack mounting it, it looks like its about 20 inches long so I would imagine the boards would be too long

Could you mount the boards length ways in a old spondoolies case tho? but I would imagine you would have heat issues toward the back of the case imho.
Would be willing to give it a go if I had the spare cash