Hi Taser, one question please;

I have two antminers s9, ( 13.5 and 14.0 ) and 1600w bitmain psu. The temps I´m getting with stock firmware are of 75C.

I have tried with every single bminer you have attached and different frequency options but the temps increase to 110C and the antminer turn off itself after a few minutes running. What I´m doing wrong ? Because I can see here many successful antminer users getting more hashing and keeping low temps, is because they are using any kind of refrigeration ?

Thanks for your help !