Fans stuck at 2000 rpm

i received leopard earlier today and installed it, and since then the fans are stuck at 2000 rpm (+/- 5 rpm).
during normal use this is okay, cpu temperatures stay at about 52 C/125 F. but if i start any more processor intensive application (vmware fusion, civ IV, etc.) the temperature rises up sharply but the fans stay stuck at 2000 rpm. when the cpu temperatures reach 80 C/176 F i kill the app because i can't afford to burn my processors.
on 10.4.9 the fans would be running at 6000 rpm at those temperatures...
does anybody know what's going on? i'm feeling a bit panicked and don't dare properly use my mac...

wow! you are a lot braver than i am. i didn't dare let the temperatures go over 80C.
but following your example i decided to test too, and at about 82C the fans started ramping up (though slowly!) allowing the temps to reach over 87C before lowering them again to 80C at about 500 rpm.
it just seems freakily high to me, i hope the apple engineers know what they're doing.
anyway, thanks for testing this for me and solving my problem, i'm more at peace now.

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I have a Mac Pro thats been upgraded from dual 2.0 Ghz Dual-Core Xeons to dual 1.86 Ghz Quad-Core Xeons (Xeon E5320 Overclocked to 2.33 Ghz).
I know there are a few other users out there that have done this mod, and I am wondering if any have experience any fan issues after updating to 10.6.2.
After the 10.6.0 install all is fine. Update to 10.6.2 and all fans but the power supply fan are stuck at 1600 rpms. I can move them higher, but not lower than 1600.

Be sure you've removed all of SMC fan control. Use Easy Find - VersionTracker or MacUpdate - to hunt for any remaining components.
If you are still unsuccessful then in addition to resetting the SMC/PMU try resetting the PRAM as well.
You may eventually need to reinstall SMC fan control in order to reset the fan speeds to normal levels then disable fan control and uninstall it.

Dual G5 cpu B fans stuck at 300 rpm

Hello,
The intake and exhaust fans of one of the CPUs of my dual G5 (June 2004) 1.8GHz are pretty much stuck at 300 rpm (as measured by iStat Pro, and you can also clearly see and feel that they run very slowly.
The result is that the fans of cpu A rev up quite often and noisily, which is annoying. It seems to be basically the same problem as described by another post (without resolution), but with the fans of CPU B stuck at 300 rpm instead of those of CPU A: http://discussions.apple.com/thread.jspa?threadID=823143 (I can also reproduce that changing from reduced to high performance momentarily increases the speed of the CPU B fans to about 600 rpm, after which they immediately fall back to 300 rpm).
X Resource Graph and iStat Pro both show that the temperature of CPU B is the same as that of CPU A right after boot up), but afterwards remains consistently higher (45°C-51°C vs 42-48°C, or 115°F-124°F vs 107°F-118°F). So it appears that the temperature sensors work fine.
I've run the hardware test cd and it did not find any errors. During testing, the fans of both cpus revved up as expected.
Any ideas?
Thanks,
Jonas

{quote:title=Drew Reece (Re:co) wrote:}{quote}
Some more things to try?
Do you have the Developer tools installed? There is a pref pane extra called processor, it allows a cpu to be turned off. It may be worth trying to see if turning off the processor has any effect on it's fan speed. If the cpu cools with no use, then you know the issue is with the controller.
There is more info http://developer.apple.com/qa/qa2001/qa1141.html
I have tried both that and setting the number of cpus to 1 via the boot args. Cpu B in that case does not get as hot as otherwise, but it's not really cold either (about a constant 46°C). Apparently, the cpu isn't really shutdown by the OS if it doesn't use it, it just doesn't get any code to run.
I also wonder what the ambient air temperatures are.
Right after bootup, about 36°C for both. After a while, about 2°C less that the cpu temperature for cpu B (presumably because its fans barely blow), and still about 36°C for cpu A.
I'd be tempted to try a clean install without istat or any other sensor reading software installed, you don't know if the software itself is part of the problem. If it is bad enough you should be able to tell from sound. My understanding is that the fans run at different speeds to avoid causing vibrations.
As I've said several times in this thread already, I have both tried with a clean install of Mac OS X 10.3.4 and with a Linux live cd (which includes full support for fan control in the G5's), and the behaviour there is identical.
Another thing to try is to take out the fans and test continuity between the connector and the fan. If you have a multimeter you could test between the connector and the fan (under the round grey sticker)
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The rear fans would require removing stuff that invaildates the warranty, so you should seek out instructions for that yourself.
I doubt any G5 today is still under any kind of warranty, especially any June 2004 models. I have once before disassembled it to the point that I could access the rear fans, but it was a pain without a proper tool to pop out the plastic pin fixing the metal cover over the processor heat sinks.
Afaik, there is also no service manual online that contains the information on how to take appart the June 2004 G5's, only earlier models (which don't have that plastic pin). There are some descriptions available from people who did it themselves, but the tips they gave did not really help me (I think I spent about 30 minutes prying with very small screwdrivers, half mutilating that pin in the process)..

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Hello,
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I'm not experiencing any problems with operation but the fans at this speed are extremely loud and annoying; is there anything further I can do to try to fix this? I'm a bit new to macs, is there a program that gives you more powerful fan control than the one I downloaded? How much would something like this cost to get fixed by Apple? Thank you in advance for any advice.

You likely have blocked vents inside or a hardware issue, like a failed sensors to trigger the fans at default max warp speed.
If your adapt at opening it up, you might want to take a look at these videos and get yourself a can of air spray + tube and blast out the obstructions out from the inside.
http://eshop.macsales.com/installvideos/

CPU A's intake/exhaust fan stuck at 300 RPMs

Hi all,
As I write this post I'm waiting for iMovie 08 to shunt a project to the media browser so that iDVD can use it (oh it'll just be another 210 minutes or so). The fans in my DP 2.0 G5 are a-blowin' but imagine my surprise upon firing up Hardware Monitor:
CPU A: Intake Fan:*300 RPM* - Exhaust Fan: *300 RPM* - Die Temp 60.5 C - Current: 28.93 A
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Hi all,
As I write this post I'm waiting for iMovie 08 to shunt a project to the media browser so that iDVD can use it (oh it'll just be another 210 minutes or so). The fans in my DP 2.0 G5 are a-blowin' but imagine my surprise upon firing up Hardware Monitor:
CPU A: Intake Fan:*300 RPM* - Exhaust Fan: *300 RPM* - Die Temp 60.5 C - Current: 28.93 A
CPU B: Intake Fan: *2731 RPM* - Exhaust Fan: *2780 RPM* - Die Temp: 73.1 C - Current: 31.85 A
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Once iMovie done I'll run AHT but can I assume that perhaps the sensor and/or fans are defective? Perhaps the CPU itself?
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Frank

Macbook pro 13" june 2009 fan rpm remains at 2000 rpm when temp is 85c

Hi,
I've just bought a new macbook pro 13 inch and updated software vis software update.
I've noticed that the fan rpm went to 2700 rpm on every boot but
after a few minutes it goes down to 2000 no matter the temperature is
I'm using iStatPro to see the temp and fan
I've tried open youtube videos to raise the temperature to 71 but the fan remains the same at 2000
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Thank you

Thank you for the info
I've just tried resetting the SMC but no luck.
since this is my first mac computer so I'm not sure if this is normal or not
after an investigation with different scenarios of work load I found that
room temp : 27c
cold boot : cpu 45c
: fan 2000 / 2700 rpm
warm boot : cpu 58c
: fan 2000 / 2700 rpm
running parallels
with windows 7
and visual studio : cpu 75c
: fan 2000 rpm
The fan did kick in to 3500 rpm once the temp is 85c
I'm not sure if this is normal or not since my Dell M1330 xps
which running vista and visual studio shows only
cpu: 58c
fan: 3000rpm
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and use it only when I work on Windows but not sure if the program will damage
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Does fans in macbook pro 13 schoudl still run 2000 rpm?

Hi i have problem with my macbook pro 13' when it gets high temperature around 95 c fans are still runing at 2000 rpm schoudl they do that or rise

You don't want to use a fan control app because they override the sensors in your MBP.
At 90ºC, I would think that the fans should be running at a far greater speed than 2000rpms. Mine can rev up to around 3000-4000rpms when the machine is really being overtaxed.
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Clinton

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Hi, I bought an MSI 780 Ti Gaming card last week. One of the buying points being that everybody was real happy with how silent it was. However mine was being quite loud. I tried setting the fan speeds to lower but I noticed the tachometer being stuck at 2700 rpm while reviews mentiond som 1000-1500 rpm.
Setting the fan speed to 34% or 100% doesn't have any effect. Both GPU-Z and Afterburner show the tachometer stuck at 2700RPM.
Does anyone know of a way to fix this? Is this reason enough to ask for a replacement card?
Thanks in advance

also
Quote
Setting the fan speed to 34% or 100% doesn't have any effect. Both GPU-Z and Afterburner show the tachometer stuck at 2700RPM.
what VGA drivers did you used?
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what about Afterburner version used?

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Hi, i have msi x58 for 1,5 years but yesterday a problem occurred. The cpu fan stuck @ ~1000rpm no matter what the cpu temperature does. It happens from the moment i power my pc, so when i get in to BIOS in health center i see that cpu fan runs at 1000 rpm. I have disabled the smart cpu temperature feature.
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PS I also tried prime 95 to stress the cpu, the temperature reached 90 degrees C, and the problem persists.
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No problem--you're quite welcome.
The fan was the simplest and quickest troubleshooting suggestion--and simple and quick are a nice way to fix problems.

Fans stay at ~1800 RPM no matter what!

Hello,
I've got a previous gen mini (out if warranty, too). I am using smcFanControl and it tells me that my mini's fans stay at around 1800 RPM, no matter what. More than a few times, the temperature has gotten to 160 F, and the fans stayed at ~1800 RPM.
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Do you actually hear the fan?
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How many degrees of cpu, the fan start to increase rpm?

Hi guys, i have a mac mini late 2012 i5 processor. The fan is constant about 1800 rpm also when the mac is hot.
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There is a method to know if the fan working?

I have been using > http://www.crystalidea.com/macs-fan-control on my 2010 Mac Mini for several years. I use the Sensor-base algorithm to control the CPU/GPU temp's. With a lower setting of 148F (64.5C) and an upper setting of 194F (90C), the exhaust fan speed slowing ramps up from 1800rpm to around 2200rpm and the Mac Mini never goes over 160F (71C) even under a heavy load.
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Macbook Fan Noise at Low RPMs

My Macbook makes an annoying buzzing noise when the fan is running at low rpms. It sounds almost like a motor running and is very irregular. If I use smc fan control to up the rpms to near 3000 this noise stops and becomes the usual noise for a fan running at higher rpms.
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To add to Michael's statement. There is a 14 day window for returns. If you just got it return it and get a different one.

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I have the following temperatures right now and my fans remain at 1000 RPM and do not change speed. I can run a program called Fan Control and manually change the speeds, the controller works, but does not appear to be controlled by temperature.
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CPU A Temp Diode = 57°
CPU Core 1 = 53°
CPU Core 2 = 48°
Enclosure Bottomside = 37°
Graphics Processor Chip 1 = 51°
Graphics Processor Heatsink = 55°
Main Heatsink 1 = 40°
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The fans will speed up at a heavier load on the CPUs.
If you want to test this, you can open two terminal windows (Applications > Utilities > Terminal) and in each of they type (or just paste):
yes>/dev/null
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Quitting Terminal will give you a prompt to ternimate the processes.
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My Early 2015 MacBook Pro fans are at 0 RPM and my cpu temperature never fluctuates

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Fans going at 6000 rpm with little cpu usage--computer too hot?

Hi,
I am not sure what normal temperatures are for my computer, but often the fans are running at 6000 rpm when the computer doesn't have all that much going on. When I am trying do anything actually demanding, the fans are running non-stop. I've also noticed that things have just been running rather slowly, with lags in mouseclicks and typing. I am not sure if these are related, or why the computer might be working so hard to complete simple tasks. Here is a picture of iStatPro showing what's going on--CPU is 95% idle and the fans are at 6000 rpm. Does anyone know if the temperatures shown are normal or what I can do to improve the situation?
Thanks!
Laura

It seems the image cannot be enlarged.

Fans stuck at 2000 rpm

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