okay the old s-9 controller allows any s-9 to down clock
I have 2 of them I purchased them as spares last year.
so I can set and s-9 at 450 freq do about 10th and be a bit loud
I will put them in this box made for avalon's
at 20th I will use 2100 watts which is 300 watts less the 2 avalon 741's
running at 15th
so I will save 300 watts and get 5th more hash.
not sure how loud this will be if i get to 56db it will be a success .
you won't see this until bitmain sends me my s-9's about 30 days from now.
https://bitcointalk.org/index.php?topic=2245487.0