The ATX 1600w supplies are super expensive but I found a reasonably priced 2400w mining PSU which has at plenty of 6+2 pin connectors to power my 7 RX580 cards and their respective risers. I have a spare 600w ATX PSU which I'm thinking about powering the motherboard and everything else with. I'm just not sure if I'm going to be blowing something up by running things in this manner. I'm assuming that both power supplies need to be turned on at the same time which I considered doing through a surge protector. Or could I get away with turning on one and then the other and if so what order? Does it even matter?