My friends and i have three rigs running, two with 8 Radeon RX 580 8 GB and one with 7 Radeon RX 460's 4 GB cards (i have a few posts about our rig). My friend has been managing the rigs and found that they were very unstable at times and sometimes i would log into the pool at night and see they were down, which was frustrating.
After troubleshooting, he discovered 4 of our 8 GB cards (all the red crimson type, none of the black fans) were causing the entire rigs to go down thus he removed them and he redid the bios on them. They still are not running well thus we have left them off the rig till he can figure it out and now we have three beautiful rigs running great. Here is the rigs action now: