Well I just checked and with the firmware that is on the controller card that is my S5+ it only goes to 500 Mhz.  Which leads me to my next question, could an S7 controller card work on an S5+ card.  I sent the OP a PM to see if he got this straight from bitmain or 2nd hand.  I have a funny feeling about this but kind want to leave it at that until I get more information.  If he tells me 2nd hand, I am 99% certain I know who it is.