Did you ever build your 4 gpu build (from https://hardforum.com/threads/best-x399-board-for-1-cpu-4-gpu-multihead-lan-gaming-workstation.1956040/)?
Thinking of building something like this...
Just a Info so that not that some makes that same mistake that I just did
Noctua NH-C14S + ASUSTeK COMPUTER INC. Z170I PRO GAMING (LGA1151) = no more Space for your Graphicscard