Update-
The S9j boards were exactly the same as the my S9.
I swapped it for a faulty S9 and it’s running slower/Mhz than the other two?
Is the control PCB picking it up?
so three boards
4.4th s9
4.4th s9
4.1th s9j
total 12.9
I put typical numbers that may be close to you if set at full speed.
Please let us know your numbers for each board.
anything close to what I am listing is likely silicone lottery and the aging process.
really way different numbers
like 4,4,2 means the low board is failing