I have seen a couple people set 162.5MHz and .67V claiming to get 1,500gh at ~1,000watts.
I got my S4 in the mail yesterday. I will be attempting these setting tonight. I will let you know how it goes if youre interested.
How did your under clock go?
So... took a little longer to get up and running than expected but 162.5M @ .67V seems to be steady at 1,450-1,500GH @ 1,000-1,050Watts.
I will let it run for a couple hours to double check stability but seems to be good for now.