MP 1,1-5,1 PCI Fan not Running

[thielsa]

My Mac Pro 5.1 PCI fan is not blowing. I am trying to sort out whether the fan is dead or whether there is a different issue. I downloaded a fan controller app which has allowed me to modulate speeds on all of the other fans. The PCI fan shows zero RPM and I can not get it to run. I am running Big Sur and when I was initially setting up my computer it was crashing. I have traced it to the NVME drive overheating. I really need a solution to this or I am going to have to go back to the SATA SSD drive I have. Does anyone have any suggestions?

 

[h9826790]

Noctua NF-A12x25 PSU fan for 4,1 & 5,1 cMP

Today I did a test install of the Noctua NFaA12x25 120mm fan for my 4,1>5,1's PSU. The fan comes with a "low noise / LOWER RPM" adapter cable connected to the original PSU fan socket on the motherboard, NOTE 1 : I had to shave off one of this cable's 'raised locater guides" to allow the Nocuta...

forums.macrumors.com

Mac Pro (4.1/5.1) aftermarket fans WITH automatic SMC control

I've been reading around this subject for a while as a pet peeve of mine is noisy computers. My normal workstations are entirely passively cooled and silence is bliss, but I do still use my cMPs when I need machines with a bit more power or more cores for testing virtual environments and the...

forums.macrumors.com

 

[Macschrauber]

Got a buddy whose fan was simply defective, replacing is dead easy,

two Philips Screws on the bottom of the fan housing and pull.

If you have another 4.1/5.1 cross change it to clarify

 

[thielsa]

Got a buddy whose fan was simply defective, replacing is dead easy,

two Philips Screws on the bottom of the fan housing and pull.

If you have another 4.1/5.1 cross change it to clarify

Thanks.... I bought one on eBay.