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Yosemite and CPU fan speeds

Thomaspin

Thomaspin

macrumors member
Original poster
Jun 27, 2013
39
1
Silicon Valley, CA
Both charts are for dual X5675 3.06GHz Westmeres running Geekbench2 stress test (more demanding than the one in GB3) with all cores loaded in an upgraded 2009 Mac Pro.

No fan control utility used in either.

Mavericks 10.9.4:

UX1jyZUP

Yosemite 10.10.0

T8xA3drC

Some comments here have stated that the Mac Pro's fans are quieter in Yosemite than with its predecessors. In the above, Mavericks was running the CPU fans at 3,200rpm compared with 2,200rpm in Yosemite, explaining the large jump in CPU temperatures in Yosemite.

The service limit for the X5675 is 178F (with Yosemite CPU A reached 151F - almost 40F warmer than in Mavericks) so if I was doing demanding video renders all day long, I would seriously consider using a fan control utility to speed up the CPU fans. On removal, after one hour of the stress test in Yosemite, the Processor tray/heat sink assembly was very warm to the touch, almost uncomfortably so.

Data are much the same over many machines and many tests. Best quality thermal paste was used.
 
For your info. Without any fan control software, my 4,1 will run my W3690 to 185F (85C) with idle fan speed. And then only speed up a little bit to keep it at 185F. The native fan control logic seem no change from Mavericks to Yosemite.

I've keep this config for quite a long time, and never have any thermal warning in the thermal log.
 
I've had the same temp changes since the first beta version of yosemite and It freaked me out for a while thinking my SMC was faulty but so many people reported it I just download SMC fan control which auto starts on boot and set some presets as a cool CPU is a happy CPU ;)
 
h9826790 said:
For your info. Without any fan control software, my 4,1 will run my W3690 to 185F (85C) with idle fan speed. And then only speed up a little bit to keep it at 185F. The native fan control logic seem no change from Mavericks to Yosemite.

I've keep this config for quite a long time, and never have any thermal warning in the thermal log.
Click to expand...
I have 4,1 as well..but i seriously don't know what the heck you guys talking about...i just happened to run into this thread....would i also need fan control? isn't there native one?
 
In general, no. Your computer will work fine without any fan control software. However, it's design to run the CPU at max temperature (when fully loaded) in order to keep the fan noise at minimum. So, if you don't like this setting, you can install some other fan control software to make your own thermal setting (e.g. lower temperature but more noise).
 
I have a 2009 Mac Pro flashed to 5,1 and running a 3690 (10.9.5)

The cpu fan at default is nowhere near those speeds though, it's 855 for the boosta fan (mainly because the 600rpm of the exhaust fan creates a vacuum and speeds up the cpu boosta fan by sucking the air through).

The other fans run at 600 or 800rpm by default.

Can you guys clarify what you mean?
 
h9826790 said:
In general, no. Your computer will work fine without any fan control software. However, it's design to run the CPU at max temperature (when fully loaded) in order to keep the fan noise at minimum. So, if you don't like this setting, you can install some other fan control software to make your own thermal setting (e.g. lower temperature but more noise).
Click to expand...

Thank you so much for this explaination...i was worried for a second there...
Where can i download 4,1 version of this fan control thing?
 
Sharky II said:
The cpu fan at default is nowhere near those speeds though, it's 855 for the boosta fan (mainly because the 600rpm of the exhaust fan creates a vacuum and speeds up the cpu boosta fan by sucking the air through).

The other fans run at 600 or 800rpm by default.
Click to expand...

This is completely normal. Exactly the same as my 4,1.
 
maclove4life said:
Thank you so much for this explaination...i was worried for a second there...
Where can i download 4,1 version of this fan control thing?
Click to expand...

There are few fan control software available. e.g. Mac Fan Control, SMC Fan Control, etc.

And I personally prefer this one. You can simply adjust the threshold temperature in system preferences to setup your own fan profile. e.g. If you move all the slider to the max position. It will roughly give you max CPU temp between 70-75C (ambient around 35C), and won't speed up the fan until your CPU above 60C.

On top of that, you can also increase the min booster fan speed to something like 900RPM to cool down the north bridge for few degrees with virtually no fan noise increment when idle.
 
Last edited:
1) Unzip the file, then you will have a folder that contain 4 files.

2) open Terminal

3) Type "cd " (with space) then drag the folder (which contain that 4 files) to terminal

4) Hit Enter

5) type "sudo " (with space) then drag the file "install.sh" to terminal

6) Hit Enter

Enter password if required. And then check your system preference and choose Fan control. You will see something like this.
Screen Shot 2014-10-23 at 03.31.28.jpg

You may then setup your own fan profile.
 
Thomaspin said:
Both charts are for dual X5675 3.06GHz Westmeres running Geekbench2 stress test (more demanding than the one in GB3) with all cores loaded in an upgraded 2009 Mac Pro.

No fan control utility used in either.

Mavericks 10.9.4:


Yosemite 10.10.0


Some comments here have stated that the Mac Pro's fans are quieter in Yosemite than with its predecessors. In the above, Mavericks was running the CPU fans at 3,200rpm compared with 2,200rpm in Yosemite, explaining the large jump in CPU temperatures in Yosemite.

The service limit for the X5675 is 178F (with Yosemite CPU A reached 151F - almost 40F warmer than in Mavericks) so if I was doing demanding video renders all day long, I would seriously consider using a fan control utility to speed up the CPU fans. On removal, after one hour of the stress test in Yosemite, the Processor tray/heat sink assembly was very warm to the touch, almost uncomfortably so.

Data are much the same over many machines and many tests. Best quality thermal paste was used.
Click to expand...

What did you use to generate those graphs?
 
h9826790 said:
1) unzip the file, then you will have a folder that contain 4 files.

2) open terminal

3) type "cd " (with space) then drag the folder (which contain that 4 files) to terminal

4) hit enter

5) type "sudo " (with space) then drag the file "install.sh" to terminal

6) hit enter

enter password if required. And then check your system preference and choose fan control. You will see something like this.
View attachment 507549

you may then setup your own fan profile.
Click to expand...
thanks!!
 
h9826790 said:
1) Unzip the file, then you will have a folder that contain 4 files.

2) open Terminal

3) Type "cd " (with space) then drag the folder (which contain that 4 files) to terminal

4) Hit Enter

5) type "sudo " (with space) then drag the file "install.sh" to terminal

6) Hit Enter

Enter password if required. And then check your system preference and choose Fan control. You will see something like this.
View attachment 507549

You may then setup your own fan profile.
Click to expand...

thanks!

----------
Denis Ahrens said:
Hi

There is one step missing.

6) Doubleclick on the FanControl.prefpane

Denis
Click to expand...

at what part?
 
FWIW i've installed Yosemite and fan speeds are exactly the same. Using iStat to monitor.

It's idling slightly cooler, however that could just be due to colder ambient temps for all i know :)
 
on my 2012 6-core.

Stock fan speeds had my booster fan set to 600rpms, causing my IOH Tdiode (northbridge) to idle around 71C and when in heavy use get near 80C.

Using iStat I bumped the booster fan up to 980 rpms minimum speed and now it hardly goes above 60*C and it also brought down my cpu temps a little as well.
 
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