freq set to 600, all boards show the same, fan at 90%, approx 12.7th scoring, noise wise its the quietest of 5 s9's - no howling
So they sent you a non autotune machine. I'm good with that.
I have had good luck with the autotunes.
I put a replacement board in a non autotune machine but ran autotune firmware on it. The two original boards ran 600.
The new board autotuned to 625.
So replacement boards can be autotune or non-autotune. It appears the board makes the difference, you cannot see an autotune board unless you run autotune firmware.