I've got 8 x rx580 on 2x750W PSU - 1.1kWh
6 x rx580 on 2x650W PSU - 0.9kWh
I've got GPu hangs everyday (also freeze windows) and read that PSU can fix it.
But is it possible with so much power left in PSUs?
If you GPU overclocked and there is no low voltage mod, I think your PSU overloaded. My overclocked 6x570 farms are running on 2x775W PSUs and it is now about PSU's limit I think.
It happened cuz 750W on PSU label does not give you efficiency of 100%.