MP 1,1-5,1 PSU fan issue on Mac Pro 5.1

[fesso]

Hi everyone.
The fan blowing on my PS seems to be running at full blast and it's really loud! I did read through all the threads on here but I couldn't find a solution to my particular set-up.
I thought maybe trying Airout or Airout2 might work but I am running Sierra and do not want to update as I will lose my Adobe CS6 suit and FCPX that I paid for and frankly the versions I have are more than adequate for my uses.
I installed Mac Fan Control 1.5.11 and it's showing a zero value for the PS fan RPMs and yet it seems like it is going at full speed judging by the noise. (screenshot attached) I can not increase or decrease or control the fan at all with the App. I can control all the other fans however.
My specs:

Mac Pro 5.1 (2009)
Sierra
3.46 6 core Intel
64 GB RAM
SSD boot disk
Sapphire RX 580 Pulse 8GB

Any ideas on how to remedy would be appreciated.
Thanks!

 

[arw]

Airout is mainly for the fan in the PCI bay, so it wouldn‘t make a difference for the PSU fan anyway (although they are in some way intertwined).
Judging by the PSU temps and your description, I suspect the fan doesn‘t report its tacho signal to the SMC and therefore your Mac rises the voltage of the fan to the maximum.
Other than a SMC reset and joggling the fan connector (on the motherboard upper left side) only a fan swap comes to my mind.
I went for a Noctua NF-S12B redux-1200 with just a re-arrangement of the pins as described here:
https://forums.macrumors.com/thread...rket-fans-with-automatic-smc-control.2232167/

 

[KeesMacPro]

As mentioned by @arw the fan tacho reading is missing, so the SMC increases voltage to the max (12V).
I'd clean and reseat the fan plug ; the fan connector is on the upper left corner of the LogicBoard.
The fan cable is routed behind the LogicBoard.

If this doesnt solve the issue and/or you want to replace the PSU fan (for a OEM Delta or e.g. a Noctua), you can leave the old fan cable behind the LogicBoard and route the new cable through the optical bay .
This way you dont have to remove the LogicBoard and lots of other parts.

The link ( post#2 ) provides lots of info about how to replace the fans and mentions different fans that are tested and confirmed as a replacement fan.

Btw: MFC shows a R9 as GPU (not RX580)...

 

[fesso]

Thanks to you both for replying. The connector was not seated properly. I am thankful for such a simple solution.
Cheers!

 

[KernkraftX360]

Thanks to you both for replying. The connector was not seated properly. I am thankful for such a simple solution.
Cheers!

Hey, would you be able to let me know which connector was not seated properly? My fans are running at full speed during boot too.

 

[arw]

Hey, would you be able to let me know which connector was not seated properly? My fans are running at full speed during boot too.

The one labled "PSU FAN". Upper left of the motherboard.
But as you say "fans" and "during boot" it sounds like a different problem.