With this firmware ...does anyone tried to use a different PSU ?? Less than 1600 w?
Could I use a 1200 or 1k ?
im using a 1000watt for mine
At the lowest voltage setting at ~15 / 16GH/s/s you can run it at 750watt - 800watt. So my advice would be to have at least a 900+ watt power supply for this.
Make sure not to connect al boards as you're still on the stock firmware, otherwise you'll blow the PSU. First flash it / set it to the lowest voltage / 400Mhz and then connect all the boards.
Mines pulling 1000watt @17.5gh/s psu was handling 1290 when i first started but I underclocked to 481 and almost 0 errors for the first 24hours