Interesting way to take a failure prone piece of the GPU mining chain out of the equation. I would never run 20 cards through one board, but it makes it easy to have a very stable 10 or 12 card rig that has redundancy. I love the power switch on the board, and the code display. The only way I think it would make sense to run 20 cards on this board is if you had a farm and 50+ GPU's so you could run fewer boards and manage issues more easily. Happy with my AsRock H110 BTC+. I hope this board coming out reduces the price of H110 BTC+ so I can buy more on the cheap.