Quote from: goose777 on January 24, 2018, 08:17:36 PM

Just an idea, but be mindful of your power situation. I have 4 D3's and they will throw errors if I run too many in the same room because the house wiring is weak, there's not enough power for all of them. If it doesn't trip the breakers, they will throw the errors. Another issue could be your power cables. You want a 14 gauge I believe? And you want them short, longer cables lose efficiency per foot.

The fact that 1000 watts powers one rig fine but fails to do so for the others indicates a power sourcing or delivery issue to me. Potential fire hazard. Take care with your other PSU cables as well, I've read they can catch fire sometimes if overloaded. Better safe than sorry.

Another idea could be poor internet connection that causes errors while updating, ip conflicts or data dropping, but that's unlikely.

Lastly, it could be a problem with the OS itself, which also seems unlikely.

Quote from: minimalist55 on January 24, 2018, 12:16:18 PM

Hi, maybe a motherboard problem?
Putting on and off again and again many times the riser connectors may damage ports.
Yesterday I noticed that one of my Pci-Ex ports cause senseless heat problem to GPU.
What are the last errors of OS before rebooting?

Thank you for the substantial inputs!

I solved the problem, actually found the problem. One PCI port in each card is not working. I added the cards one by one and found the slot causing problem. I tried with one gpu on that slot and it is not working. Sometimes it starts to mine with that slot but lasts 5mins or so. Tbh it does seem unlikely to have one slot in two mobo, but maybe I screwed smth during restarts, changing risers etc. Today I am going back to the store, maybe they can replace if the slot was DOA.