Sorry, that 1 s9 was my only spare. I have s9's from batch-1 on up but am not about to cripple the older ones by dropping in auto-tune controllers...
Bumped the freq up from 575MHZ to 600 and hash rate climbed from ~11.8 up to 12.9THs. Happy happy happy!
I understood from the S9 thread auto tune is in software - you can drop in the fixed frequency firmware from Bitmain and fix the frequency lower for the auto tune S9's...only useful if you want to reduce temps (and hash) from what I gather
Mainly I want to reduce fan speed... My S7s are fine at 30% speed, the S9s are like a jet engine (even though they're in a cooled room)... so you think one could load an older non-auto tune firmware on a newer S9?