Ok, I think I've narrowed down the problem to the controller. I've tried changing out the PCIe cables, putting the miners on the cables on the right side, and nothing worked. Then my buddy tried plugging the batch 7 into the controller on one of the batch 8 miners, and then we were able to see all of the 3 boards show up (but it wouldn't hash).

The really unfortunate thing is that the batch 8 miners will not run more than 1 miner on the same controller like the batch 1-7 miners can. Hence, I'm stuck.

Tried updating the firmware today, to no avail.

Now I'm playing the waiting game on the RMA to have a response by bitmain. I submitted the ticket on friday, and still haven't heard back today yet.

Anyone else having the batch 7 controllers fry consecutively like this?