Changing Fan Speed On iMac via Windows?

Well I've been browsing a lot about how to change fan speed on iMac from windows. I use windows primarily for development and sometimes my computer can get pretty hot and my room can get really hot because of it. So if anyone could tell me how to do it, it would be extremely helpful. It would even be ok if it was low level assembly code. I just want to change the fan speed on windows and I can't find a program to do it. Thanks in advance.
Matt

Oh it's fine! I kind of wasn't extremely helpful because I have seen a lot of previous posts with not much results (they were a few years old though). Yea the only reason I do use windows is because of .Net framework development :\. I would like to switch to all java but I like XNA and Visual Studio. Mono ***** so I'm just waiting for something good. Anyways thanks for the help. And if any low level mac programmer see's this, please tell me how you could go about this!
I'm sure if someone had disassembled OS X they could figure out how to do it. (Not promoting this because I'm pretty sure it's illegal).

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as i know, controlling the fan is not possible for this serie of lenovo.

How to change fan speed on Satellite P100-286?

Hi,
First, know that Im French so sorry for bad English I may use,
I work in a confined area with some other computers, and, it becomes pretty hot in there...
My P100-286 (Ive also seen it called P100-473) is quite hot and I want to speed up the fan manually because it seems that the OS I have (Vista SP1 or Debian in dual boot) can't do it and the problem is that the CPU, and probably the geforce, are heating the keyboard and this is really unpleasant ...
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> the problem is that the CPU, and probably the geforce, are heating the keyboard and this is really unpleasant
The point is that the P100 was equipped with high performance CPU and GPU and both devices produce a lot of warmness.
May I ask you what graphic driver you have installed?
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The non-Toshiba graphic drivers dont support such protection and therefore using non Toshiba GPU drivers could lead to the higher temperature.
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Well, "Media" is the name of the drive. You must now partition and reformat it in order to create a new volume:
Install OS X Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
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Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
If you have a bootable USB flash drive for Mountain Lion, then boot from it rather than the Internet Recovery HD. Once the installer gets started you can select Disk Utility from the Utilities menu in the screen's menubar. Follow the other directions provided.

[Solved] Asus L1366 mobo, cpu fan speed control

Hi, everyone,
I finally have this new core i7 system, to replace my old AMD athlonx2. I have one question about the CPU fan speed control.
I remember that in my old system, the cpu fan speed control works out of box, no configuration is needed.
But when I install arch 64 on this new i7 system, the cpu fan is running at its maximum speed constantly while the CPU temperature is modestly low. I know there is a wiki teaching how to do it.
However, I am just curious why it doens't work out of box any more? Does CPU fan control work for you guys out of box normally? especially the new Core i7 cpu users?
Please let me know, really appreciated it.
Thanks a lot.
Update: the issue is solved, see my last post, the solution is blacklisting: asus_atk0110, instead use w83667hg.
Cheers.
Last edited by mark.altern (2009-10-01 08:18:18)

First off, it would be useful to know what the sensors-detect script actually reports.
Okay. How fan control works on Linux: First, navigate to /sys/class/hwmon
Each of these folders, i.e. hwmon0, stands for a sensors monitor / fan controller on your mainboard that may control one or several fans. Inside hwmonN, there should be a subfolder called device, which contains several interfaces if your BIOS allows software-side fan control. You can read them with cat and write to them with echo.
Examples:
pwm1_enable shows if OS-level fan control is enabled (1) or disabled and in BIOS control (0). Changing fan speed won't work if this is disabled. (i.e. cat /sys/class/hwmon0/device/pwm1_enable reports 0 -> disabled; you could enable it with echo 1 > /sys/class/hwmon0/device/pwm1_enable).
pwm1 allows to change fan speed. The values range from 0 (fan off) to 255 (full speed, 12V).
fan1_input shows the current RPM if a fan is connected. You can only read from this interface. Its useful to check all of these in the each of the hwmon folders to find out if there is actually a fan connected to the fan controller (they often have more ports than mainboard manufacturers use).
There might be a fan1_div, this is somehow related to how the kernel reads the RPM, I don't know how it works.
temp1_input interfaces can appeare too, if some of the chips have temperature sensors located somewhere. I *think* lm_sensors places the core temperatures it reads from CPU (the coretemp-isa-000X thingies) in one of the hwmon-folders too.
There might be interfaces for different fans in the same hwmon folder, i.e. pwm2_enable, pwm2, fan2_input, etc., all interfaces with the same index belong to the same physical fan connector, and all in the same hwmonN are managed by the same IC on your mainboard.
Warning: These interfaces, if they work, control the fans directly without any kind of security measure. If you shut some essential fan down, it will stay off until you reboot your CPU shuts down.
(If you see something likein0_alarm, in0_input, in0_max, etc. it's a voltage monitoring chip.)
If one of those interfaces can do something, OS-level fan control does work, if none of those folders contain a working pwm interface, fan control seems to be unavailable.
Sometimes there is an option in the BIOS to enable it, and for some BIOSs software-side fan control only works if dynamic fan control is disabled in the BIOS and fan speed is set to a static value - or vice versa.
I don't know what you are using to control fan speed, there are many applications that use these interfaces, i.e. GNOME or KDE power managers, so I'm not sure what is happening:
IF: Windows 7 enables OS-level fan control and sets it the RPM to those you observed and you have nothing that provides fan control in Arch and so fan control stays at BIOS-level, which might also read out a different sensor / the same sensor differently or it might be more conservative in setting fan speeds altogether;
OR: You have something that provides fan control installed in Arch and it reads out a the wrong value supplied by lm_sensors and thus sets a higher fan speed.
Anyway, possible solutions I can think of:
Find out if you have some kind of fan control software and what it does. For example, I use the fancontrol daemon, I can't help you if you use something else.
The wiki mentions how to assign a fan speed to a certain temperature sensors. You might assign it to a different one. For example, there are no sensor chips on the mainboard of my EEE (no temp1 etc.) so I assigned the fan speed to the temperature reported by the BIOS via ACPI (those are in /sys/class/thermal, also no "device" subfolder on EEEs):
FCTEMPS=/sys/class/hwmon/hwmon0/pwm1=/sys/class/thermal/thermal_zone0/temp
You could also change the MINTEMP/MAXTEMP values to one higher than those you actually want to compensate for the effect of lm_sensors reporting temperatures that are too high.
It is currently not possible for a mortal user to change the coretemps lm_sensors reads, see this post, last paragraph.
There is a configuration file, /etc/sensors3.conf, you can change sensor names and adjust offsets here, but only for the monitoring chips and their sensors that are on the mainboard.
Last edited by Malstrond (2009-08-19 19:34:22)

G5 Jive fan speeds unacceptable (to me).

I have been running two extra HDs mounted on the floor in front of the CPU fans for some time. With my homebrew arrangement the four CPU fan speeds are higher (via Hardware Monitor) than the unmodded arrangement by 200-300 rpm typically, barely audible and quite acceptable.
I thought I would get a G5jive to do a "proper job" instead of my "homebrew". However the jive causes blockge equivalent to three HDs even if you only fit two drives, and the fan speeds have gone up by around 1000 rpm, very noticeable and unacceptable to me.
What are others experiences? I searched before buying and didn't see anything about fan speeds, only about power draw and cut out on start...which has not been a problem for me even when I tried three drives in the jive.
Thanks
Mike

I have gone back to my 'homebrew' set up with two drives in the compartment in front of the CPU fans, but this time mounting them right at the edges and as high as possible. This gives a nearly unobstructed flow to the fans, especially the lower CPU B fans, and speeds have dropped accordingly, especially for CPU B.
When mounted on the floor, as I had before, and as the G5Jive does, the flow to CPU B fan is blocked more than CPU A fan. Yet on my G5, CPU B is always working harder, more current, more fan speed. So raising them up has had a much bigger effect on CPU B fan speeds.
One of the two extra drives is a 150 Gb Raptor, my boot drive. Mounted where it is, it is running 10 degrees C cooler than the drives in the drive bay, which must be good.

IMac (Late 2006) fan speed is 4600 rpm and nothing will change it

I just brought my iMac 24" 2.16GHz Late 2006 back from the Apple Store today and the ODD fan is running at 4600 rpm!!! The noise it generates is way too loud. It is comparable to the wind tunnel G4 I replaced. Any thoughts on how to lower the fan speed?
I took the iMac in on 12 Sep to repair microphone and video crashes. They repaired the mike and replaced the video card with an NVIDIA GeForce 7600GT. I picked it up on 3 Oct.
I have SMCFan and iStat Pro installed to monitor and adjust the minimum fan speed. I tried the usual troubleshooting steps (e.g., reset PRAM, Safe Boot, ran troubleshooting utilities, etc. to no avail.
bill

David,
Looking through my old posts to refresh my memory, my face is red as *I AM* mistaken:O
http://discussions.apple.com/thread.jspa?messageID=4064287&#4064287
I was recalling that Intel iMac users were doing the wrong SMC result three years ago (actually they were doing the SMU reset that was for the pre-Intel G-5 iMacs), and that you and I explained to them the correct way - which is of course what you recommended above:D
Nevertheless, since there is no further risk of causing the fans to race in this instance, I would myself do the wrong SMC reset method, and if it does not work, turn right around and do it the way Apple recommends. This still might result in correcting the problem.
By the way, it was widely reported three years ago that the SMC reset was frequently not successful on the first attempt, so the alternative is to try this harmless procedure at least several times before giving up on it.
Message was edited by: myhighway

24" iMac 2.4GHz Fan Speed

Hi,
I recently purchased a 24" Intel iMac 2.4GHz. Forunately I haven't experienced any crashing or freezing problems like some users have, but what I have noticed is that the fan(s) seem to speed up quite significantly for no apparent reason when the machine is idle.
When the computer is doing absolutely nothing sitting at 32 degrees, the fans speed increases from around 1200rpm up to about 3300rpm.
Can anybody tell me if this is normal for the 24" iMacs? I used to own a previous revision 20" iMac and I hardly ever heard the fans kick in. It wouldn't normally bother me, but the fact that it makes a lot of noise is kind of annoying.
I have updated to 1.1 with no joy. Currently I am using iStat Pro via Dashboard to read my system performace.
Thanks,

Elusive,
Any luck finding an answer? I have a similar problem.
My Hard Drive fan is running 5000-5500rpm all the time.
I've followed the instructions for resetting the SMC:
http://docs.info.apple.com/article.html?artnum=303446
But this did not help. It seemed to get progressively worse. At first going full speed only occasionally, then after around an hour of use, then less. As of tonight it comes on when I turn on the machine (after being unplugged for several minutes) and stays on at the >5000rpm speeds.
If you find a solution, let us know.
Thanks,
jp
My setup:
- 24" iMac 2.4GHz Intel (new/aluminum)
- checking stats with iStat Pro widet
My Fans
- Optical Drive: 698rpm
- CPU fan: 1200rpm
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Fan speed increases and windows 7 freeze on my Satellite A200

I am using Toshiba Satellite A200-24A (PSAE3E) from 3 years now. It came pre-installed with Vista. Last year i switched to Winows 7 Ultimate. Everything was fine.
4 months ago, i switched to Windows 7 Enterprise N. Hated to see no Windows Media Player in it. Now the problem is, during online video streaming (not always the case), my fan speed inceases, so do its sound, and my hard drive gets real busy. 10 seconds later, my window is freezed. Actually, its not responding due to excessive hard drive usage.
I read many articles over the internet, lots of toshiba users are facing the same problem when using Windows 7. But, i couldn't find any solution to it.
This problem started 3 months ago, then for sometimes, it stopped itself. now, it started again 3 weeks ago. If anyone can help me regarding this issue, i will me more than grateful.
Here are my specs:
Windows 7 Enterprise N. Service Pace 1
1.73 Dual core
Ram 3GB
Hard Disk partitions 75 GB + 75 GB

I presume CPU usage goes to 100% and result is freezing. Can you identify background process that can be responsible for this?
> I read many articles over the internet, lots of toshiba users are facing the same problem when using Windows 7. But, i couldn't find any solution to it.
Your opinion is too general. Lot of Toshiba users have a lot of different problems with Windows7. My notebook was also delivered with Vista and since one year I use Win7 32bit and everything works perfectly.
> This problem started 3 months ago...
This make the whole situation more complicated. What have you done 3 months ago? Have you changed some settings, installed some additional software that can be responsible for this?
Unfortunately it is not easy to help in this situation.

Satellite A500-138 - How to change the fan speed?

Hi,
I have a question how to I can change speed fan on my A500?
I mean with BIOS change power, I dont have advanced option on my BIOS so I cant change that... Any ideas?

Hi buddy,
You can change the speed fan in Windows Power Management. Therefore Toshiba Value Added Package must be installed but its already installed if you use the preinstalled Windows from Toshiba.
Open the Power Options: Start => Control Panel => Mobile PC => Power Options
Click on Change plan settings and in advanced settings you should see the option Cooling Method. There you can change between 2 different modes.
Check this!!!

IMac (early 2009), 3.06 GHz, ATI 4850 - fan speed and temperature questions

Well, so I downloaded and installed Temperature Monitor and iMac Fan Control - mainly for observational purposes and not for toying around with the fan speeds and I've got some questions. Mind you, I haven't tampered at all with the fan speed settings, just installed Fan Control. Here are my readings (while browsing the internet with Safari and doing a chat via iChat):
Fan Speeds:
CPU fan (desired) 1300 RPM / (current) 1530 RPM
HD fan (desired) 2100 RPM / (current) 2099 RPM
DVD fan (desired) 1300 / 1298 RPM
Temperatures:
CPU Heatsink: 92°F
Internal HD: 108°F
Internal DVD: 95°F
GPU Heatsink: 107°F
Are these, under the circumstances, normal readings?
Thanks in advance for your replies.

Your welcome and no problem. I would say only the Apple engineers can tell you why the fans are set to those speeds however my best guess is the obvious they found those speeds the closest to keeping the temps at an optimum operating temperature. I found when I'm doing graphics intensive work my machine heats up but quickly cools down when I'm done.

IMac 27, i5/i7 - Fan speed / temperatures during gaming?

Hi all!
This is my first post in this forum. I have searched a lot in the internet, but I have not found any reliable information on this topic.
I currently have a MBP (see signature) and I am really happy with it. However, each time I am playing a game (just casually), the fans accelerate to 6200 rpm within a few minutes which is really annoying (= very loud, high frequency noise). Typical games are Sims3 as well as the Steam games TF2, Portal, and Torchlight. Furthermore, I am playing games like Black&White2, Bioshock or Chess using Parallels 5/Win XP.
I am now looking for an additional desktop computer - and I am loving the idea of buying an iMac i5. However, I would really hate to hear this loud fan noise again... (the alternative would be a Dell XPS 7100, but I really love OS X after 20+ years using Windows).
Thus, I am looking for reliable data (fans rpm, cpu/gpu temperature) during gaming (under steam os x, parallels, and boot camp). Also any experience on long-term reliability of iMacs used for gaming is appreciated.
Thank you very much in advance!
P.S.: Hope my english is not too bad, since I am not a native speaker...

It's a simple match - the more power your computer uses, the hotter it gets, and the faster and louder the fans. The graphics card and CPU are the most power-hungry parts, and are used at a high percentage during gaming.
That said, my current iMac is the i5 (27", 4850) and it doesn't spin up the fans at all playing Torchlight at full native resolution. It does start whirring a little playing Bioshock/Portal/HL2, but not so loudly - the fan speeds go from 1100 (normal, nearly silent) to 1450 or so.
Temperatures I've not followed - but they don't actually matter, just the noise that is made to keep them under control.
In Boot Camp, much the same - although I don't have a fan-speed monitor for Windows, again HL2 would just slightly speed up the fans.
But! I would suggest waiting a short while, it's 10 months since the iMac range was last refreshed so it could be just about time for them to be updated.
ps Your english is perfect, I would never have guessed you were not a native speaker.

How can i install a windows version 8 on a 3 year old iMac 27 (only windows and nothing else not via bootcamp = result shut be a clean iMac with windows - no

When i now had recieve a brand new 27" imac, i had a 3 year old model 27" imac which my daugter want to have BUT i should be as a clean Windows thing -
so how to change the computer to a clean windows 8 computer with no apple programs in and no Maverick or other lovely programs?
I had seen on the net that a lot of peoble had windows with bootcamp - i am not a computer tecnician and when i try - i end op with a machine with could nothing - no mac programs - no office pack - no adobe programs - so i had to start op again with a new harddisk.
Some of the problem is that i dont understand the thing which bin told when you go to bootcamp for a user of mac's since the model was the "classic" and we make newspapers on them - so i want and easy way to have and mac computer for my self (the new one) and let my daugter have a beutiful imac with windows on.
dont begin talking about parrelles i had try that, results it had a windows 7 which cant be updated, apple dont support that and microsoft doesnt so - help me
regards
Chevron B50

If you don't want Boot Camp and you don't want a virtual machine, go buy a Windows computer.
Both Boot Camped Windows and Windows running in a virtual machine work well. Your issues are because of your lack of knowledge or understanding, not because Boot Camp and virtual machines are poor products. Universities, large and small businesses, home users, etc. use virtual machines to run their operating systems.
Your statements about Boot Camp and Parallels are not the experience of thousands of users.
Either find someone who is knowledgeable about running Windows on Apple computers to help you or buy a Windows computer. Believe me, if you find a way to install only Windows on your Apple computer without using Boot Camp or a virtual machine you will have more problems than what you have already experienced.

I need to install windows 7 on my iMac (via bootcamp), should i stall 32-bit or 64-bit option?

I need to install windows 7 on my iMac (via bootcamp), should i stall 32-bit or 64-bit option?
Thanks

If your system is Core2Duo or better, use 64-bit. 32-bit only sees 3.5 GB RAM max. 64-bit Home sees 16 GB RAM max, and 64-bit Pro sees 192 GB RAM max.

Changing Fan Speed On iMac via Windows?

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