Mac pro 5,1 fan running high PCI & PS

cpnotebook80

macrumors 6502a
Original poster
Feb 4, 2007
816
75
Toronto
Just noticed that the fan runs loud and constantly when I open a browser like firefox or safari. So I installed macs fan control. See attached.

The PCI and PS(Not sure what PS is.?) seems to be running high for some reason and then slows down. I have OSX sierra. The main OSX is on a pcie ssd.

The graphics card is an amd 7950 and is the only graphics installed. See attached image of what I see in the system report.

The fans are quite now but they do run high when you open browser or some small app. not sure if i have to be concerned.






 

owbp

macrumors 6502a
Jan 28, 2016
717
241
Belgrade, Serbia
@Filin I think that is the case with nVidia GPUs only.
I've had 3 HD79xx cards (two 7950 and one R9 280X I still own) and never had similar issue.
PCI and PS fans are ramping in my Mac when GPU is under load and hot, but 25˚C for PCIE Ambient is far from hot.
Screen Shot 2017-02-20 at 9.11.39 PM.png

You can see my PCIE Ambient with two monitors connected. When I connect only one, it goes down to 30-32˚C and PCI Fan goes back to 800RPM.

@cpnotebook80 , Im almost positive that rivet has snapped on your Northbridge heatsink.
But I don't think that is causing any problems you have.
 

Yo-Yo Buffalo

macrumors newbie
Dec 6, 2017
16
5
Weird, my Mac Pro 5,1 fans have just started going nuts too. They are always on and often at full and very loud. It always used to be silent unless i was doing heavy work.

I can't figure out what it is. Nothing has changed, I've not upgraded or installed anything.
 
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