you might be pushing the PSU past it's limits. with stock 570's tom's showed 784watts running Furmark. any OCing will drive this up even more. you PSU is very solid and would probably take it for a while and you might not necessarily draw max power while gaming. I would plan on getting 950-1000W PSU to be safe.
Thanks! That's what I thought. Also, thank you for the chart. I will be getting a 1000w for the safe side.