https://techcrunch.com/2018/05/31/asus-announces-a-motherboard-just-for-crypto-mining/

Mining hardware is weird stuff. Either it’s commodity hardware used – inefficiently – for complex computation or specifically-designed, expensive boards that can be used to bring in Bitcoin and little else. Asus, a motherboard maker of some renown, is now helping bridge the gap.

The H370 Mining Master is a basic motherboard that supports 20 graphics cards, the boards used for Ethereum and other less resource-intensive scripts. The cards connect via PCIe-over-USB and each port has is individually controlled and managed by on-board diagnostics. This lets you ensure that each graphics card is running properly and fully connected.