Yes that sounds right, at 1183W you would be at 2183W with your Matrix cards. They normally use basic reference cards @ 150W each..lol You forgot to add the extra,.. Did you run two calculations, first with 3 cards and then second time with 4 cards. To see what they are allowing for each card ?, You will need to do the math allowing 400W per card. Overclocked , at max settings, under full load.
If they are allowing 150W per card then X 4 = 600W
your Matrix cards spec. @ 400W X 4 = 1600W
So just add 1000W to your calculation and you would be at 2183W, "Provided they are allowing 150W each card". You will need to confirm exactly what they are allowing, I'm only speculating the 150, as that is what they "normally" allow for each reference 7000 series card.
By running calculation twice,
Edited by Braegnok, 29 December 2012 - 10:24 AM.