@ggilbert13
this board was de facto standard for mining till mid-2017, until better boards started to appear that accepts 8-9-13 or more gpus.
you can see it in genesis mining videos, and few other large scale mining facilities.

therefor, I would dare to guess that you may have a problem somewhere else. with riser, riser cabels, psu, os setup or even the cards itself.

of course, it may be that it just doesn't love your own mining cards, but to have several MBOs that are "broken" points me that problem IS somewhere else.