will try the 880 tomorrow and let it run for a 6-7 hours
maybe the autotune are best way to make 13.5 machine run great. because in one unit, three board has a different best frequency
Autotune locks the voltage and gets the best frequency around the stock for efficiency that bitmain locks to it. The boards will have a different best frequency since they are not all created equal. But they should still end up within 10-300gh/s of each other for the most part.
There will be an autotune version being made where you just pick your voltage and it will search for the most stable mhz per board so each board will have a different frequency.