How do you properly configure a setup where you can set up multiple psu:s in a single motherboard for example in this mining rig in the cryptomined.com - website
Use the 2 or 3 PSU adapter ribbon. Connect the PSUs to it. Connect the PSU powering the MB to the MB with the fat cable from the adapter and your other video cards and their risers to the other PSU. Google it up, you’ll get all the facts you want.