Is it single rail or multi rail ?
The multi rail can supply 850 watts to all connectors just not all at the same time! this is what companies do not tell you. Single rail is way better because it does supply it all at the same time I think its your PSU use single rail instead like I do with all the latest protections much better and much safer to!
I am a disabled engineer make sure if its multi-rail if you insist on using it that it can provide 25 amps on each connecter. just look at the PSU it should say it.
just looked at the PSU Specs that PSU should not have a problem unless you overclocked it. If you did what was the frequency ?
Guaranteed to deliver 850W continuous output @ 140°F (40°C) operating temperature
notice what it says 850w continuous output @ 40c the supply heats up and your are no longer at those operating temps on the PSU so you are going to get less that 12v@69a
This is the main reason why I run each miner on a separate PSU which are all EVGA Supernova 1300 watt G2's it only pushes the PSU's at 50 percent load! so they stay at rated operating temps.
Anybody can argue if they like because you want to be cheap I really don't care I have a B.A.S NY state board of regents with a GPA of 3.95 with 15 years field experience. so that more than qualifies me.
Just because I am disabled does not mean I am not still qualified. I got hurt in the field when a IDIOT put together Server racks that were incorrectly done because he insisted he knew what he was doing and a whole rack of servers fell on top of me. so I am no longer able to work and I really liked my job it was my career and my life I enjoyed going to work.
He had to be overclocking it.