Mac Pro Fan always on very fast

Hey everybody,
I was searching forums because my Mac Pro 4-core fan was on high speed (2800rpm) from boot for no heat reasons. I then realized my APC 350 Battery Backup/sure protector was insufficient so I got a "550" backup and so far (fingers crossed) everything is fine.
Just wanted to share that with anyone having the same trouble. Cheers!

Your UPS is still underpowered.

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Hi, I have been having some problems with a Mac Pro I have been working with. At the Start-up the Fan goes to top speed and once it logs-in the fan is still pretty loud. I've checking the Temperature of all the computer parts via a Temperature Diode, and its normal and not high. After searching the internet for hours looking for posts that were for the Mac Pro and not for the MacBook Pro (which comes up in about all the searches using the words Mac Pro Fan Problem) and I found some software all of which is not for Mac Pro's. Is there any application I can run do reduce the RPM of the Fans, Reset the Fan Speeds to only turn on when it get hot, or something along those lines.

Thats odd, seeing as Apple have it listed in the Support article:
To reset the SMC on a Mac Pro:
1) From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
2) Unplug all cables from the computer, including the power cord and any display cables.
3) Wait at least fifteen seconds.
4) Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer.
5) Press the power button to start up your computer.
It does exactly the same thing as the SMC_RST button, simply by removing all power from the system. I would assume the reason for this would be that the SMC settings are stored in RAM, which is erased once the power is removed from the board, hence the minimum 15 secs wait which gives time for the capacitors in the power supply and system to discharge.
So yeah, it does do the trick, or has done for me in the past a few times.

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Hi everyone,
on my early 2008 Mac Pro i had a problem with a noisy fan. Updated from 10.5 to 10.6.8 and the problem seemed solved.
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Hi everyone,
on my early 2008 Mac Pro i had a problem with a noisy fan. Updated from 10.5 to 10.6.8 and the problem seemed solved.
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I checked the activity monitor and there's nothing major going on with the CPU.
Any suggestions?
Thanks in advance
Gabriele

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Everything was wonderful until 10.8.4...
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Thanks y'all!
Machine specs -
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2x 2.66 6 core intel Xeon
20Gb 1066mhz DDR3
Nvidia quadro 4000
4 hard drives
1 super drive
Running dual monitors
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I know there aren't 'as many' but it is better now than it use to and you don't need $2000 Quadro 5000 or something, a $600 GTX 680 or somethjng from EVGA will do
Don't know what but MacRumors did a good job on one thread detailing possible GPU AMD FirePro possibilities. Yes it is huge change.
People have always said that about PCs. I have a few. Not for gaming but that is the only way if you want like a small percentage of users, to spend on GTX 690 x 3 for $$$ (big bucks just for gaming).
I can't recall a Mac Pro 5,1 2010 with 2.66GHz (sounds like a 2009) and 12-cores. 2,26 GHZ yes but that is just, does not make sense to give up MHz for more cores. The 12-core 3.34GHZ custom build, yes, but again that was never an Apple BTO choice either.
Apple has always disappointed geekheads you might say.

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As we've repeatedly mentioned, the fans are designed to run all the time, in a 2000-6000 RPM range. If at any time speed falls to zero, "Houston, we have a problem" time has arrived. The heat load from the CPU (and GPU, if so equipped) would quickly reach the danger zone.
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Ambient: 23
HD Bays: 23,25,24
Mem Banks: 22,21,25,25,25,27,27,22
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My 10K Raptor took a week to 'settle in' (or get burned in) and it did seem to cause a hum from the case. Took out the Raptor, no hum or vibration. I also made sure it was seated tightly, and moved it to slot #4.
I ran a 6 hr ZoneBench 511MB test file 30x using 50 "zones" which gave it a good workout. I then ran Disk Utility Erase and under options, chose 7-way write (took a couple hours was all).
Might want to read the review from SilentPC on the 150GB Raptor series.
New Revision, New Noise?
I was ready to put the Raptor in an external case or something at one point (and people probably remember my posts, was a little over a week ago) but someone else told me to "give it time" and just give it a thorough series of tests (like zero the drive at least once). I always load a drive with large disk images when I first get it before putting it to regular use.

Mac Pro fans all of a sudden running extremely loud!

I restarted my computer routinely and when it booted back up the fans started running very loud. They have never run this loud before.
I reset SRC and PRAM as well as replaced the power cord and cleaned the dust out. I also checked that there were not any programs running at high CPU. Nothing new was installed on or into the computer. The computer is not running hot.
I don't know what else to do
The loud fans does not affect the performance of the computer but it's a work from home computer and I need these fans to quiet down!!
This is a MAC pro 1,1 running OS 10.7

Readers have reported "all fans" went to high speed, but on closer examination it sometimes turns out that the graphics card fan, all by itself was making all that noise. If that is the case, the prognosis is very different.
The side door is not interlocked, and can be removed with the Mac Running to determine the exact source of the fan noise.
Caution: The European Commission has determined the anyone living in Europe is not smart enough to keep their fingers out of the plastic fans used in a Mac Pro, so they have been banned Mac Pro silver tower from sale in Europe for over a year now.

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Turn off? hard or soft? ie, does it do a normal shutdown? if not the directory could be damaged.
Apple Hardware Test would be step #1.
Dust build-up or high ambient temperatures or not getting enough ventilation. You could use smcFanControl shareware app to force fans to higher rpm than 500-600 minimum rpm.
SMC Reset would be another.

Mac Pro Fans run extremely high!

Hello,
I'm a video editor working within Adobe Premiere Pro CC, and I edit all kinds of footage from DSLR all the way up to RED 5K. I have a Mac Pro (5,1), 6-Core 3.33Ghz with 32GB of DDR3 ECC 1333 MHz RAM. Also in there is a GTX 770 Graphics card with 4GB on board RAM, and a RAID controller.
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My system is out in the open, plenty of vintilation, and relatively dust-free.
Recently swtched graphics cards from a Quadro 4000 to this GTX, thinking the Quadro was the culprit, but the problem persists.
I've attached two screen shots of SMC Fan Control before and after the fans kick up to full speed. I don't know anything about the layout of these fans, or what does what. I also can't seem to run Apple Hardware Test to see if everything is fine...I try pressing the D key when booting up, but it just regularly starts up. Any other way to test the hardware?
I realize the graphics card will heat things up a bit, but this still seems abnormal. Can anybody help me troubleshoot? Or at least provide an explanation of the fan layout of the Mac Pro, or list some recommended fan speeds? I just can't seem to figure this thing out.
Thank you so much.

beauleland wrote:
I realize the graphics card will heat things up a bit, but this still seems abnormal. Can anybody help me troubleshoot? Or at least provide an explanation of the fan layout of the Mac Pro, or list some recommended fan speeds? I just can't seem to figure this thing out.
Thank you so much.
It does look abnormal, especially if Activity Monitor doesn't show any processes using much of the CPU's capability. Keep in mind that going full blast, your CPU can show up to 1,200% usage in Activity Monitor (six cores, two threads each).
First, we both have the same Mac Pro with the same amount of RAM. Based on Temperature Gauge (from the App Store), the intended minimum and maximum speeds for the fans are PCI - 750/4500, PS - 750/2800, Exhaust 750/2800, Intake 600/2800, BOOSTA 800/4000.
Working up, the Intake fan is at the bottom of the front grill. The Exhaust fan is at the back end at the same level. You've had the processor tray out. Inside the processor block (the box behind the DIMM slots with horizontal fins) is BOOSTA. There'd be a BOOSTB if you had two CPU's. Those three (or four) fans cool the CPU and RAM. Above all that is the PCI fan, which is set in a bit from the grill and, for some reason, doesn't fill it's space at the front so, theoretically, the air could blow into the PCIe area, make a U turn around the right side and go back through the fan again. Finally, behind the optical drive bay is the PS and the fan is at the front of the PS. There's also a fan on the video card, and I've never seen a monitor which could show that fan's speed or temperature.
I keep an eye on smcFanControl's temperature reading in the menu bar and when it heads north of 100ºF I start going to one of the higher fan speed settings I've established. That's probably being over-cautious but I like my Mac Pro. And if the fans can't do the job, it's time to blow the dust out, and that includes the dust inside the video card.
Hope that helps some.

Macbook pro fan always on

Hi,
So as of a couple of days ago, whenever I use my macbook, doing some very basic tasks (like using the internet/word processing/whatever) the fan always revs up and works quite hard.
I am aware of that sometimes programs are stuck on high CPU (i.e. flash) and hence take up quite a bit of memory, but these last couple of days, nothing is out of the ordinary when I check the activity monitor and normal amount of memory is used.
So now my computer is constantly very hot and fan is always working hard? Any ideas how I can fix this?
I've attached two images of what the activity monitor usually looks like.
Could the fan have stuff stuck in it? If so, how can I fix it as I have a unibody macbook pro.
Cheers!

Like stedman says, in activity monitor click where it says %CPU so it arranges the processes from highest to lowest to check if you have any runaway processes, and if you have any that are running at a high % (80%+) select them and click Quit process.
if there are no runaway processes try reseting the SMC

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I assume you have tried the "obvious" stuff, like using the brightness buttons (F1 = dimmer, F2 = brighter) or turning up brightness in system preferences>displays. I'm sure you tried all that, but I just had to say it just in case. Anyway, you may want to try reseting your PMU...
PMU stands for Power Management Unit and it is a chip that controls the backlighting of your display (among other things). To reset your PMU do the following:
1. If the computer is on, turn it off.
2. Disconnect the AC Adapter and remove the computer's battery.
3. Press and hold down the power button for 5 seconds and then release the button.
4. Reconnect the battery and AC Adapter.
5. Press the Power button to restart the computer.
Those are the official apple instructions, but I suggest in step 3 you hold the power button down for 10 seconds.
Here is a link that refers to reseting the PMU on a MacBook.
http://docs.info.apple.com/article.html?artnum=303319
good luck!

Mac Pro Fan always on very fast

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