415Mh/s with 12x RX 580? with that power consumption, I highly doubt it
I have a 13 RX580 rig with 402 mh/s and 1750W draw on the wall. Hence power consumption is possible. But max hashrate to squeeze out of one RX580 maybe 32 mh/s x 12 = 384 mh/s.
Dear
We are team of professionals and we made custom factory changes in memory timing for particular mining usage in GPU, That is why it did not require any Overclocking nor any particular OS.
We used a Special BIOS for our custom motherboard also.
That's it we can not reveal more information.