When I initially bought the Asus B250 Mining Expert I didn’t know much about it other than it had 19 PCIe slots and theoretically it can hold 19 gpus*, but that being said that is a big *.  Many variables and very deceiving on the 19 gpus part.  Either way I like the board and it’s features on it.  Looking forward to the Mining Master board so I don’t need to deal with USB risers.