Can you try the following, use OverdriveNTool and under volt your cards just a little bit, let say 900mV and report back. If you can mine with this then you might have an PSU issue
Here are the settings the cards are currently at.
https://i.imgur.com/iJ1rIDH.pngAll the cards are set here. I am not sure where to change 900mV as you suggested.
Nah, I'll definitely discourage you to do OC settings when you do troubleshoots
and I doub't if its a driver issue when you could go 1 cards successfully, based on the picture.
Have you already Done this?
INCREASE VIRTUAL MEMORY
In search type This PC, right click on it and choose Properties
Then click on Advanced System Settings
On Advanced tab where it says Performance click on Settings
Click Advanced tab
At the bottom you will see Virtual memory, click on Change
1. Uncheck Automatically manage paging file size for all drives
2. Check Custom size
3. In the Initial size (MB) type: 3000 (or directly 16000)
4. In the Maximum size (MB) type: 16000 (or more like 20k)
5. Click Set , then OK and Apply
Restart the rig
So I attempted to put one of cards on the PCI-e 16x slot, and it worked fine. Hashed without issue. However, I do not believe it is the riser. I have swapped out MULTIPLE risers and still had the same issue. So you think it is the power supple then??
Well, If you are out of luck this is possible, we've seen users that has 16pcs of brand new risers all Faulty

Yeah, I set the virtual memory. Still no luck. I think I am going to RMA the power supply and if that solves the issue.