[2 is fine, still only about 165W per PCI-E.
So each of the 9 hash boards draws about 330 watts apiece?
So the remaining 500-sh watts is for the fans and the controller?
Itll be about 90W for the fans, 20W for the controller and the rest is PSU inefficiency. I calculated with 90% PSU efficiency so at 93 it makes it 170W per PCI-E when using 2 a board.
The product page specifies the controller board must be powered on after the hash boards.
I will use a seperate smaller gold or platinum atx unit, or put a time delay relay inline with the second 2880.
The relay wouldn't void warranty would it? It is still being powered on after the hash boards.