CPU Fan is always at 5000+ RPM!!!

So I did an upgrade today. I now have a P4 3.0E (prescott) processor, an MSI 865PE Neo2-PFS (Platinum Edition), 1GB of DDR400 RAM, and a new pci-firewire card
The minute I hooked this sucker up everything worked, but the cpu fan is always at 5000+ RPM (as reported in the bios pc health monitor). I thought the motherboard lowered the cpu rpm depending on the temperature, but apparently it's CoreCenter. I use linux and obviously cannot install CoreCenter. Is there any other way I can get my fan to lower it's speed? maybe an equivalent linux software that does the job?

I Agree With Mr. Moleman, as with all of the Heat related Issues that have been Plaguing the Prescott, I would NOT Be Supprised if it is Written into the Latest Precott Microcode in the BIOS, to Run the Stock INTEL Thermal Solution at 100% Speed.................Sean REILLY875

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CPU Fan Speed always LOW? -- K8N NEO4 Platinum SLI

I'm wondering if anyone can help me out. My CPU fan speed is consistently around 850 RPM, both at idle and under full load. This is shown in the BIOS, with Corecenter, Everest, and Speedfan. I have Cool n Quiet disabled in the BIOS, CPU Fan Target in BIOS set to 40 deg (have had it at 60 as well), and Windows Power Scheme set to Minimal Power Management. I've even tried enabling Cool n Quiet to see if it actually did anything...but fan speed is still the same.
It seems everyone else has CPU fan speeds in the thousands rpms. Mine never changes, is always around 850.
My CPU temps vary between 37C idle and 48 load when my ambient room temps are around 75 deg.
What's up with my CPU fan?
EDIT: Speedfan doesn't seem to work for adjusting anything. It only shows my CPU (fan2) and NB (fan3) fan speed, but adjusting the percentages has no effect.
My Config
MSI K8N Neo4 Plat SLI
Athlon64 3200+ 939 Venice
1GB (512MBx2) PC3200 DDR OCZ Value Series 2.5-4-4-7
Leadtek GeForce 6600GT
Hitachi 7K80 SATAII 80GB x 2 in Raid 0 (nVidia RAID controller)
Antec True Power II 550
Maxtor 80GB + WD 80GB 7200 RPM on IDE1
Sony DRU-500A DVD+/-R/RW
Windows XP Pro SP 2

Try setting cpu fan speed to max to access this open corecentre & click on logo.
should give:-
Select user mode & set Fan to max. This info is held in the corecentre chip & is the only way to access it .
Only keep corecentre installed for this function
hope this helps.

Cpu fan is running at -1 rpm!!

h, i've been facing slight problems with my mac that it overheats sometimes, so after some research i found out that i can download a program called fan control where i basically can control the speed of my fans. then i found out that my cpu fan is running at -1 rpm, the desired rpm is 300, my other fans (hd and dvd) are running at the desired rpm, i'm not sure if i should be worried!!! i mean do i have to replace it!? and if so where and how!!!?? btw i've just got this laptop used, it's a 15" late 2008 with the highest configueration.

Resetting the SMC was my first thought, but you have done that. You might also try resetting the PRAM/NVRAM:
http://support.apple.com/kb/ht1379
After that if the issue persists, I would call AppleCare.

CPU Fan going crazy (over 3500 rpm) all the time iMac 24"

Hello,
I have had an iMac 24" since Aug 2009. I had no problem until up a month ago (coincidentally after I installed Mountain Lion).
The CPU fan becomes very noisy, reaching 3500 rpm and more. I checked and the CPU temperature is around 90C when this happens.
It happens invariably after very little usage of the computer. Sometimes it's when I'm watching a DVD, sometimes is when I'm copying files from a USB hard drive, sometimes I'm just surfing the web.
I have brought my computer to the Apple Store twice already. The first time they told me I should reinstall the OS from scratch, after erasing the disk (which I did), the second time they told me they had found the problem and fixed it, for free! but it presented itself as soon as I turned it on back home.
The CPU temperature is around 80C right now, and I only have safari opened and I haven't reinstalled any program since I reinstalled the OS.
Do you have any idea of what it could be? Could it be that the sensor is detecting a wrong temperature? In this case, could I set the fan speed manually? I know it is not advisable, but the people from the apple store are not helping
Thanks for any help you could give me,
Biagio

Please start by doing a SMC Reset,
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
If necessary repeat process.

MSI 970a-g43 CPU fan always at 100% when fast boot or MSI Fast Boot is enabled

I turned on fast boot in my motherboard in my BIOS but now whenever I boot into windows the CPU fan is always at 100%. I really like the performance gain from fast boot, however I can't stand the CPU fan always at 100%. The fan normally runs at ~1150rpm when its off but when its on it runs full blast ~2800rpm.
My specs are:
MSI 970a-g43
AMD FX 6300
MSI HD 7870 OC Edition (Flashed with GOP vBios)
2x4 8gb DDR3 g.skillz ram

I have it set to 55c smart fan control in the BIOS. With fast-boot off it works perfectly. It seems like its not lowering the fan like it normally does when its on. If I go into the BIOS and reset it it'll work fine the first time, but after that it'll do the 100% fan speed all the time.

CPU Fan at zero rpm and temp CPU A 100C

Today I noticed that my iMac was getting a bit hot. iStat widget reported that the CPU Fan was running at 0 rpm and that CPU A temperature was 100 degrees Centigrade!
Rebooting didn't help. Then I let it cool down and did a SMC reset. Luckily this worked, CPU Fan is running again at 800rpm.
I believe that it was pure luck that I noticed this, so I don't know for how long my fan wasn't working. Could this be harmful for my computer? Any suggestions what I should do to check if something is damaged?
What can I do to avoid this from happening in the future?
Best regards,
Jeroen

its connected to the motherboard. and its a simple case fan that lian li gave me. spins at 2200rpms about. and no bios cant see it spinning either and i tried another case fan that i know that works and still cant detect it. it was working fine the other day! it was just yesterday that i noticed core center started beeping telling me its not detecting speed.

What is the correct way of quieting down the CPU fan?

Hello,
Let me first ask for recomendations on an aftermarket CPU Heatsink and Fan to replace the stock one on my AMD x4 965 Black edition CPU please, My profile on this forum has my computers equipment and case etc. But if you need more info please just ask..
Would somebody please give me instructions on how to make the stock CPU cooling fan run at a more appropriate RPM when at idle and or when running with a load on it please.
The stock CPU cooling fan usually runs up there at about 5,000 to 5,500 CPM even when at idle and it's seriously insanely loud, too loud to be sitting next to it and trying to concentrate on work or even playing a game.
I've been loading up the Overclockers Center program and choosing the default profile since that seems to have the CPU fan set to around 3500 RPM which produces an acceptable noise level for the fan. But I figure that having to load up Overclockers Center program and choosing a profile each time I load my computer is probably not the way I should be doing it, so if somebody wouldn't mind, please explain what I need to set in the Bios or elsewhere so that the CPU cooling fan is not blowing my head off with noise all the time.
Thanks

Hello
1-This mobo is strong enough to support such a heavy coolers.Now i have i installed TUNIQ TOWER EXTREM( because of porformance/price here) that is as heavy as v8. although the company dosnt gauranty the failure but it works very well on my case and i rotate and opening the case many times for some experiments!!
2- ZALMAN is a famous cooler producer.I said the rules for choosing a cooler . You can buy one of them .The reviews on net can help you for best choise.BUt v8 is a good proven cooler because the more surface that has and material and big fan.although i didnt have another choice in IRAN.You may find so better coolers.
the fluid mechanic rules say that the surface-material-shape of heat sinks and temperature-velocity-amount of air that moves on the heat sinks are the parameters of a heat sink.
i have a bad experience.In my old case with P4 3 GHZ i bought a good cooler from THERMALTAKE .But the fans is rotating very much and made noise. There was some truth that i didnt mentioned.
The cpu is produce a lot of heat ( more than phenom) and the fan is 10 cmm i think . I replaced the fan with a 12 cmm fan but the system in loads crashed. The heat sink designed for such a fan and it must rotate very much to cool cpu .12 cm fans cant go beyond 2000 rpm i think and this amount of air wasnt enough for cooling.
3- you have a lot of wind in your case!!. I dont know that greater fan than 12 cm is safe because they use more current .But 8 and 12 cm fans works very well with onboard ports and SPEEDFAN program.
After all cooling and making the pc make less noise is a long story .You must have a target . There is a limit that you cant go beyond that so i think you must have a plan and use your money and time on it.
For my new system i had a dream: most powerful-silent-upgradable system so i choosed these parts:
POWER=CM SILENT PRO- for the design and big fan that they have.
CPU=ATHLON II 635 -I knew that phenom is very powerful but make more heat so i used this cpu and have plan for upgrading with a 6 core cpu.
VGA= 1-GIGABYTE 9800GT SILENT
2-ZOTAC 9800GT SYNERGY
choosing a gpu was very hard. 9800gt silent was the most powerful silent cpu that i could buy. but for future i bought a zotac. because it has a single cooler and dosnt occupy a PCI slot that i need.
you may say why you dont buy another 9800 silent? because this card is warm in loads and i had a fear two of them in a case may harm them. I count on HYBRID SLI technology that could shut down the second card but it is not working and i am a little disappoint .
two 9800gt in sli have as power as a GTS 270 in reviews.
CPU COOLER=TUNIQ TOWER EXTREM- According to my counts cooler was silent in ideal but in loads it was noisy so i replaced that
MOBO=NF980-G65-It uses the last chipset from nvidia with sli enabled and ddr3 and phenomii x6 support. (The mobo is hot. According to some reviews it is cooler than AMD chipset motherboards and faster but i hope it was cooler)
Good luck

I need help starting a Terminal command at start-up to help silence CPU fan

I have a 24" iMac (Early 2009) and the CPU fan runs at full RPMs - NOTE: it is a refurbished model. I think that the person who did the refurbishing either messed up the CPU Temp Sensor or something, because the CPU temps are fine and the fan kicks on right after start-up chime.
Anyways, I have found a terminal command (see below) that, when used in conjunction with smcFanControl, will force my CPU fan to run at 1200 RPM. I need a way to either auto-launch this Terminal Command at start-up, or an easier way to launch it because having to type it out in Terminal every boot and reset is getting old.
Terminal Command:
/Applications/smcFanControl.app/Contents/Resources/smc -k F2Mx -w 3cf0
Any help would be greatly appreciated!

You shell script should look something like this:
#!/bin/bash
your command line
Construct this in your favorite text editor and save as plain text, not .rtf. Call the file anything you want, but here I'll call it slowfan.
In terminal type,
chmod +x /path/to/slowfan
where /path/to/slowfan is the path to the slowfan file. You could drag the file into the terminal after typing the chmod +x followed by a space. This step is only to mark the text file (script) as executable.
Now you can run Platypus and set up a simple app with admin privleges. Then test the app. If it works you can then add it to your login items.
If you decide to use applescript (do shell script descibed earlier) then you could just use the full pathname to whereever you saved the script and save that as a applescript application. Again test it and then add to your login items. I would bother adding an alias to .bash_profile. That just adds to the complextity.
As you can see, with Platypus you only have the single app it creates to deal with. The script is enclosed in the generated app bundle for easy updating if necessary later on. With the applescript method you will need to keep track of two spearate files; the applescript and the shell script. Actually three, the app too.

Sorry, another CPU fan speed question.

Hi,
Just got a new 2011 iMac 2.5 GHz Intel Core i5 21 inch. First mac and loving it so far! I can hear the fans just slightly at idle in a quiet room and checked on this forum to see what is the normal idle fan speed.
Most of the results come back with the CPU fan running at around 938 rpm. mine is constant at 1199 rpm. A few others have this speed too, but he majority are around the 938 rpm level (some much higher). My temps also seem lower than most at idle too (due to the higher fan speed i guess).
OP Drive 998
HD Drive 1099
CPU 1199
My question/s:
Why the difference between machine (shouldn't they be set the same in all machines with the same spec with software)?
And is the normal??
Thx

Also, would I notice it being quieter with it at 938 compared to 1199?

Cpu fan stuck at max speed

Out of nowhere, my computer (early 2006 20" Intel iMac) started making huge fan noises. The iStat pro widget shows that the CPU fan is blowing at 3600 rpm (apparently the max), and the other two fans are normal. CPU usage is minimal, and CPU temperature is low (30-40 degrees C), so there's no good reason for the fan to go to the max.
I've tried (several times) to reset the SMC, but it doesn't help. A couple times over the past five days, it's gone back to normal, but then it soon goes back to max.
Anybody experienced anything like this? Any suggestions?
Thanks in advance,
Neil

I have the same problem,
I know a lot about computers (for not a professional) and after doing anything i can without opening the case,(SMC reset, Vram reset, safeboot and starting on verbose,Apple hardware test)
In my specific problem the facts are
4SNS/1/40000000:'TmOP' from apple hardware test
Cpu Fan: 3604rpm (really high) this is the logic board fan
the other 2 fans are normal
Cpu tmp: 28 C (low)
GPU diode 127 C (ridiculously high - no tmp variation) from Istat pro
Memory controller 127 C (ridiculously high - no tmp variation)
all the other temperatures, as the cpu ,are a little bit lower than normal which is normal because of the high speed fan
that means logically that the system is reading a 127 Celsius tmp in these places
and the fan is responding right
So the tmp sensor is sending a false tmp
there are 3 sensors this one is on the logicboard and you cannot change it
i went to a certified apple service provider and we open the case together,
as i wanted to be there.
I hoped with some dust cleaning or something position related we could do something but no, after checking every possible solution,
needs a logiboard replacement that he (like me) did not recommended (very expensive)
Other than the fan noise there is(until now) no other symptom, in OSX or XpPro
so I'm not going to pay about 700 euro (for everything) for this machine
I'm positive (i checked it myself) that there is nothing hot inside, just the sensor circuit is stuck at these tmp
If the the fan dies sooner its much cheaper and i can even replace it myself
I 'm very sad and disappointed with this solution but what can i do?
It is just 2 months after the warranty! and i know that this is a logicboard defect
the ironic thing is that before that happened i was thinking o upgrading the Cpu 2.0CD to a 2.33C2D (yes you can, if you really want) but now i 'm going to leave it like this and sometime buy a new thing (not an imac again!) a mac pro if i am richer or a decent PC
I really like macs and everything, but the compact feature when the time comes may have a compact problem!
the other funny thing is that they offer me a job in the Service place but i am an artist
Good luck and i hope someone finds a solution or something else

P35 - CPU fan reset when resumed from sleep

Hi,
I just got S3 sleep to work where it turns off all fans. The problem is that when it resumes from sleep, the CPU fan spins a lot faster than from boot. I've set it to run at 12,5 % as long as temps are under 65c. I'm guessing it runs at about 50 % when resuming from sleep. It does this until I restart the computer.
Tips?
/Edit; Just checked with SpeedFan, CPU fan normally runs at 1100 RPM, but after resume it runs at 1800 RPM. Any utility I can use that resets this to 1100 after resume?

I ended up disabling fan control in BIOS, so that SpeedFan would work in OS. This means that CPU fan runs at 100 % until OS and SpeedFan har loaded up. Tips to fix this through BIOS or whatever are welcome.

CPU fan revving up suddenly. GPU temp = way up.

Hello,
Title tells it all: all of a sudden yesterday night my CPU fan revved up to 3000 rpm. The iMac had been on for hours with no problem, and suddenly the fan started to go crazy.
Tried everything I know: reset the SMC and zapped the PRAM: no avail.
Can anyone help me out here?
Loa
P.S. Starting to regret this iMac... Should have gotten a Power Mac that I can at least "open"...

Loa,
I would STRONGLY recommend that while you still can you invest in AppleCare, it can only be purchased while your machine is covered by the original 1 year warranty, after that you cannot get it. AppleCare will extend your existing warranty to a total of 3 years from the original date of purchase of your machine. In addition it will give you telephone support for the same amount of time. It provides piece of mind just in case something does happen to your machine, repairs can be expensive if needed.
Regards,
Roger

IMac (21.5-inch, Mid 2010) - CPU and Optical drive fans rev up to 4000 rpm

Hello,
I just want to share my experience with my rather new Imac
I bought this Imac last April and I had the fans roaring after 2 weeks of light usage. I followed instructions like resetting the SMC, unplugging the imac and restarted.
However, I started installing other software like Paragon NTFS, VLC, Firefox and also Istat nano. This happened on a more regular basis and istat nano was showing up fairly normal temperatures - an average of 50° C and I had the CPU fan at 3800 and the Optical drive fan at 4200 rpms. According to apple support, at this temperature fans should be running at factory level or a bit more. Even when I stop all activity, the fans keep up and does not stop even after a couple of hours of inactivity on the imac. Apple support recommended that I reinstall macos on a new partition and run tests and during the tests, the only software I installed was istat nano and still got the fans going with the same result - required a shutdown to bring fans at normal levels and yet average temperatures were around 50 - 55 °C.
Eventually got apple to replace heat sensors - this did not help - still got the same unwanted result, fans reving up to 4000 rpm and not stopping and all that without going above 60°C. I was at the stage to demand a complete replacement but decided to give it another couple of weeks testing.
Last test, a complete reinstall of the OS and this time, without any other software apart from standard software delivered with the mac. Ran a few things like importing over 10,000 pictures with iphoto and some other stuff to increase activity - overall CPU usage was at 5% idle for a good few hours and could not reproduce the problem (istat nano was not installed, so I could not monitor temperature). I started installing Paragon NTFS for mac and ran the same scenarios and still no fans going crazy - putting my hands over the top of the imac, can feel a slight breeze...).
Installed other software such as VLC and Firefox 5.0 but still no istat nano and same high activity, import high volumes in iphoto and also did an empty secure thrash to increase load. CPU usage was to 95 again and still fans are behaving properly.
One thing that comes to my mind with istat nano is that, when the fans get going, the ambient value change to -140 - I do not want to rush into any conclusion but is it possible that there is some interference between istat nano and those new sensors that have come in with Imac mid 2010 (from reading mac forums, Apple has added a new ambient sensor..). Because all the time I have been reinstalling the OS, I have always installed istat nano to monitor temperature and fan speed and I always got this issue. But since yesterday, I have installed clean OS, tested, added some 3rd party software but still no istat nano and I canot reproduce the issue. I have been using the same scenario during all this testing - very high import with iphoto, viewing a film, empty secure thrash, enough to use up to 95% CPU.
Has anyone experienced this? I hope this is the cause of my problem because this mac is making my life easier at home compared to previous PC and also, I want to know that my hardware is not at fault...
I will keep you posted if I get the issue again - could be tempted to install istat nano and run the tests to see if the fans will rev up after this but not sure I want to go through another 4 days of just doing this...
regards
Philip

Hey nycbigapple2,
I'd run through the recommended troubleshooting steps for when your iMac runs slowly here:
OS X Mavericks: If your Mac runs slowly
http://support.apple.com/kb/PH13895
Welcome to Apple Support Communities!
Take care,
Delgadoh

HDD Fan stuck at a very noisy 5000 rpm - is this normal ??

I've had a Intel iMac for a while now (Oct 2006), and it's always seemed noisy but I just figured that was normal (coming from a jet-engine-fanned-noisy-PC background!). A colleague at work just bought one and he says his is really quiet so I started doing some investigation.
It seems the hard drive fan is always running at 5000RPM which seems VERY high to me. Temperature/fan speeds are :
Ambient air temp 27
CPU 1/2 core temp around 40
Disk temp around 31 (ie, not at all hot for a disk)
CPU fan speed 805
Optical fan speed 800
Hard drive fan speed 5000 !!!
The iMac isn't doing anything taxing at all. It's just used by my son who looks at web stuff and plays DVDs. The fan is running fast even on startup when the disk is cold.
I've tried resetting the SMC (unplug everything, leave it, then plug power lead in) and that makes no difference.
I'm sure this must be a fault, but before I take it into a service centre I'd like to be sure it's not something I can fix here
Thanks in advance for any help
Mike
20" Intel iMac Mac OS X (10.4.10)

I had a similar problem with my iMac. It turns out that my son was holding the power button in when he plugged in the power cord which caused the system to enter a programming mode where one or more of the fans run at high speed. I unplugged the system for about 20 seconds, plugged the power cord back in, and all was well.
Here's the article that provides the info:
http://docs.info.apple.com/article.html?artnum=304602
iMac G5 20 (iSight) Mac OS X (10.4.2)

MSI K8N Neo 4 Platinum Smart CPU Fan reports 0 rpm ?

Hi
I have a MSI K8N Neo 4 Platinum (MS-7125) motherboard with an Athlon 64 3700+ CPU and an Arctic Cooling Silencer Ultra 64 HSF.
In the BIOS setup, in the 'Monitor H/W' area you can set something called the 'Smart CPU Fan Target'.
o If I set this to disabled, it reports a fan speed of about 2,280 rpm.
o If I set it to 40°C, it reports a fan speed of 0 rpm ! (the fan is turning)
The MSI Core Center utility and Everest Ultimate also both report the fan speed as 0 rpm.
I assume that if I disable Smart CPU Fan, the fan always rotates at max. rpm; if I set it to 40°C, the fan runs at a slow speed until the temperature exceeds 40°C, at which point it speeds up (likewise if I set it to 50°C or 60°C). However, the fan IS turning.
Can anyone explain this ? I would like the reassurance of having the CPU HSF speed reported.
Incidentally , the PSU is an Akasa AK-P460FG
(3.3v = 30A, +5v = 30A, +12v1 = 14A, +12v2 = 15A)

Very old post yes but I feel the need to reply anyway because I have the same problem myself.
Very strange and would be nice to hear if any more of ya guys out there can see the same.
Patrick

CPU Fan is always at 5000+ RPM!!!

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