SST1000-P you tell me, Haswell AFAIK is the only architecture to give problems with PSU's.
I am well aware it has nothing to do with the brand, you assume too much.
80 amps on 12v rails suggests a independently regulated PSU, 83 amps at 12 volts is exactly 1000 watts, which this unit is rated at and can deliver 1100 watts comfortably.