By the looks of it YES but what kind of case ?, id would use one of the really good open air frames with lots of room .
The open x1 slots mean you can use 6 2 slot: it should sense are all you can use in this case is risers card.. I want one and wonder how much it will cost, if it even hits the US .
I want one of the new AM4 boards that has yet to go on sell in the US ...http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=882
i have a new design in mind for a compat air frame, that can handle easily all the 14 gpu while remaining with the same space occupied
6 cpu behind the psu/motherboard and 6 gpu in front of the six one behind the psu/motherboard, i just give you an idea
problem is the mobo is sitting in the middle and heat is a problem. I tried that setup with 4 front and 4 back ... doesnt work so well.
you need to add 3 140mm front fan to exhaust the heat and maybe other 3 in front of the first 6 gpu, overheating motherboard should be something really hard to do
with my idea the first 6 would end at half of where the motherboard is, and the other start from there in front of them