Bitmain, will you PLEASE start making the boards interchangeable with rack mount units … How fricken hard is it to engineer a board that can fit into a S4 or S2 for that matter … These units with the external power supply do not scale for home mining in any way … I think your engineers need to go to the woodshed , great work on power consumption but PLEASE think about helping the people who use real racks . Im not asking for a new unit, I would just like to swap out boards .