sorry i dunno whats wrong with the link but its a spec of it so Corsair TX850 PSU has:
+5v@30A, +3,3v@30A = 180w
Single +12@70A = 840w
840w - 180w = 660w /12v = 55A?
becuase mactronix said you have to do take +5v and +3,3v Wattage minus +12v wattage than devide that by 12?
or i got it wrong xD