Doing some more research with photos online, it appears there are definitely at least two different types of controller cards for the S9 - one with fan connectors closer to the intake fan, and one with the fan connectors closer to the exhaust fan.
As far as I can tell, the old S9s had their fan connectors closer to the intake fan, and the new S9s have their fan connections closer to the exhaust fan.
Here is a pic of the
old controller board:
Here is a pic of the
new controller board:
So now lets limit our discussion of which fan connector to use to the new controller board.
Here in an example of first fan configuration on the
new controller board:
First Fan Config: Intake is Closest to Ethernet Port = Outside/Edge Connector labeled Fan 6
Exhaust is Farthest from Ethernet Port = Inside/Middle Connector labeled Fan 5
Second Fan Config:Intake is Closest to Ethernet Port = Inside/Middle Connector labeled Fan 5
Exhaust is Farthest from Ethernet Port = Outside/Edge Connector labeled Fan 6
So for the new controller board, which Fan Config is correct?