PSU is the most critical component, and doesn't depreciate like miners. Don't cheap out... Get it from a reputable manufacture.
You say that yet you post you are running an ATX power supply. ATX power supplies are not meant to handle near their full rated output 24/7/365. They are a terrible choice for bitcoin miners.
And why is that? better efficiency and 10 year warranty is key. Great availability and support.
This one is rated to run 1600w
continuous. Its running at less than 80% load.
Maybe provide a little more technical detail on why they are no good for this application? Its the best option.