I just got notification from Hashfast (72h wait) telling me they will send me a new board and they will update me with the tracking number. It looks like they don't even want me to send back my botched board (which I think is great)

So soon I will have 2 boards, hopefully one of them will mine at full speed. But I want to use that broken 250ghps board of mine, even tho it probably got a very bad efficiency power wise.

So the question is, what do I need to run both boards in the babyjet? I already know I need that cooling system, but it seems I also need a connector cable to loop the USB to the 2nd board. I can probably solder my own cable, but would need pin assignment. Or is it just straight through? Which connectors on the board do I have to use to loop to the 2nd board?