I decided to start mining a few weeks ago and its been a lot of fun. Definitely found a new hobby. Here is my Q. I have a 750 watt evga PSU powering 4 red dragon rx 570s. When I have 3 plugged in everything is fine and they get 23-24 mhs with blockchain drivers installed. But if I plug in the 4th then the system doesnt want to boot up properly and for example doesn't recognise any device plugged into the USB ports. But with 3 all is well. Do you think my psu is too low and the likely problem? Thanks!!