Re: Will a EVGA 850 WATT Platinum be enough for 4 GTX 1060 cards?

I use Fortron HYDRO G 850W 80PLUS GOLD for 6x GTX1060.
They consumes about 810W. (Ethereum + Sia mining)

Your wattage usage is nearly your PSU able to supply. This is not safe. You should consider reduce power limit of your 1060.