The exhaust fan died on my S9(j) ordered on from here:
https://www.ebay.co.uk/itm/2-Cooling-Fan-6000RPM-4-pin-Connector-Replacement-For-Antminer-Bitmain-S7-S9/264267373357The problem I have now is that the new fan works at a whooping 12.000 + RPM (a bit noisy).
Should i change the other fan as well to reduce to total speed?
Is there a difference between s9 and s9j fans (could i have bought the wrong fan maybe)?
It appears the Fan_CTRL function limitation does not work as the lowest i got him was at 9500 rpm.
On the good sIde i got it on the exhaust side and work tooo good.
I have already tried moving the power from the Fan5 to Fan6 and back to compare (no difference has been noted).
Any advice in reducing this noisy one is welcomed
The fans (old and new, can be seen here)
https://imgur.com/a/0oosR3v