I ran my A3 overclocked at 930 Gh/s average for over one month with (low hardware errors under 2k/day per board)
I used 120V power on APW3++ and it worked like a charm!
Temperatures averaged around 62-65C for boards and outside room temps were between 60F-80F
I would say bitmain's PSU is stronger than it seems and does work well!
This is a dangerous example, since overloading the power supply may end up breaking it.
The input circuit in the APW3++ is designed to be able to handle max. 1200W at 110-120V and max. 1600W at 220-240V mains voltage.