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.
check mining.help there is a section regarding Overdrive, don't touch the freq part only the mV (next to frequency). the idea is not to OC memory/core just to lower the consumption. As you can see the memory is already on 900mV just need to lower the core. You can also shade out the steps for core and memory (check mining.help)
