Using SpeedFan to automatically control your PC’s fan speeds

SpeedFan Guide

SpeedFan is a great utility for enthusiasts who’ve built their own PC. Besides being able to show the temperatures inside your system (from various sensors in the CPU, motherboard and HDDs) and other vitals such as voltages and fan speeds, it can also automate the cooling cycles of your machine. As its namesake implies, SpeedFan is able to automatically control your computer’s fan speeds based on the temperatures reported by various hardware sensors. This can allow you to find the right balance between a cool system and a noisy one. However, it does require some configuration, as I’ll attempt to show you in the following article.

It’s all in the details

All the material I’m about to present here is available in the help file for SpeedFan, however, since most people use the Internet for everything, myself included, I thought I’d summarize the most important points. SpeedFan has a lot of functionality and it’s easy to get lost in all of that when all you want is something simple like automatic fan control. (Some motherboards already support this, but SpeedFan brings this functionality to almost any motherboard that’s reasonably new)

First and foremost, the fans that you want to control must be plugged into one of your motherboard’s 3-pin fan headers; they cannot be plugged into 4-pin molex connectors that come straight from your power supply. This is because SpeedFan controls fan speeds’ by varying the output (using PWM) of the 3-pin fan headers on your motherboard. If you want to control the speed of your 4-pin fans, you’ll have to use some sort of fanbus or external fan controller.

Getting started

On the main SpeedFan window, you may have noticed a checkbox for “Automatic fan speed”. However, checking it is not enough to properly set it up, though it would be nice if things were this easy! For now, you can check it, but nothing will happen – you shouldn’t notice any change in your fans’ speeds.

Main SpeedFan window

Click on “Configure” to bring up the options window. SpeedFan is a fairly powerful program, but that means configuration is required to make it do what you want. The assumption that SpeedFan uses is that various temperatures can be influenced by the various fan speeds in your system. You need to define these relationships. For example, in my system “Temp1″ is the CPU temperature. (I haven’t bothered to rename the labels) In the screenshot below, I have linked it with “Speed01″ and “Speed02″, which correspond to my CPU’s fan and a case exhaust fan.

SpeedFan temperatures

This tells SpeedFan that it should vary these fan speeds based on the temperature they’re associated with. You also need to configure threshold temperatures; there are two, “Desired” and “Warning”. The desired temperature tells SpeedFan what it should aim for. Once the desired temperature is reached, SpeedFan will begin to drop fan speeds down to some minimum you specify; if the temperature is above desired fan speeds will increase by an amount related to how much the temperature is above the desired. Once the temperature reaches the warning value, fan speeds will be set to maximum. (100%)

We now need to configure each of these fans. Go to the “Speeds” tab (not the “Fans” tab) of the configuration and you’ll see a window like this:

SpeedFan speeds

Remember that Speed01 and Speed02 are linked with the Temp1. Here is where we define the minimum and maximum fan speed values. When the temperature is at or below desired, the lowest the Speed01 will go is 30%, while the maximum I’ve specified is 100%. This range is for temperatures up to the warning value. When the temperature is at or above warning, the fan speeds linked to it will be set to 100% regardless of what you’ve define the maximum to be. This is a sort of fail safe to prevent overheating – better safe and noisy than silent and sorry. Also important to note is that you must check “Automatically variated” for each fan you want to automatically control. (This is separate from the main automatic fan speed checkbox on the main SpeedFan window we saw earlier)

You may need to experiment to find out what are the best values for minimum and maximum fan speeds. Also, some fans fail to report their rotational speed (RPM) when spinning slower, so you may get a reading of “0 RPM” within SpeedFan. You’ll need to actually check whether this is the case.

One last thing you may want to configure is how fast SpeedFan will begin to adjust fan speeds when it has to respond to a temperature change. This is accomplished by setting the “Delta value” on the Options tab of configuration:

Delta value for fan speeds

This sets the step-size (in percent) for fan speed changes. With a larger value, SpeedFan will adjust fan speeds more quickly since it will be increasing or decreasing by that amount each time. Experiment to find what works best. I’ve found that with too large a step/delta size, temperatures and fan speeds will oscillate – basically the fans will speed up too fast, causing the temperatures to drop, which in turn cause the fans to slow down too much, which then causes temperature to rise again, completing the cycle. If you’ve taken a course in control theory you’ll realize that this is perhaps the classic example problem in control theory. (By adjusting the delta value I believe you’re adjusting the proportional value of the controller – though I am not sure if SpeedFan implements a full PID controller)

Lastly, you may want to check “Set fans to 100% on exit” just in case you accidentally shut down SpeedFan – this is another protective feature.

Finishing up

Click “OK” on the configuration page to save your changes, which should bring you back to the main window. Then, make sure “Automatic Fan Speed” is checked here, and your system should now be set up for automatic fan control! I have been using SpeedFan for a few years and wasn’t aware of this functionality until recently. Just goes to show that you can always learn new things!

112 Comments »

  1. I have a laptop that I think needs some serious tune-up with the fan. It keeps spinning very fast every few minutes, which is very loud. I tried to configure speedfan to fix this problem, but only the temperatures of the hard drive and processor is detected. No fan RPM’s or voltages. It would be great if I could get some help…

  2. In most laptops (like yours), the CPU fan is already controlled – it speeds up and slows down with the temperature of the CPU.

    SpeedFan may support your laptop – in particular if you have a Dell notebook, there is an option for that in SpeedFan.

    Beyond that, you may have a heat issue with your laptop. Consider using some compressed air to clean out the dust on the heatsink as I described here.

  3. I know that it varies from system to system because there are lot of factors. How good the fans are, how many you have, how much air they move, your maximum and minimum speeds and temperatures, etc. In your experience, what general area do you think one should set the Delta/Step value? I realize that if you have more fans, the fans don’t need to adjust as fast and vice versa

  4. EDIT to the above: Just as some info, I have a Coolermaster Cosmos, so noise is not as much of factor as other cases, but I still don’t want them to be running full throttle all the time because there are a lot of fans, 4 case fans, 1 cpu fan, and 1 fan on the northbridge I believe. Does this mean I can have a lower delta value and/or minimum fan speed?

  5. Hi Nick,

    After some experimentation, I’ve found that a low delta value (I’m currently using the lowest of 1) works the best for me. Having the delta value too high (~10) caused the fan speeds to jump wildly around as they tend to change too fast in response to a temperature change, causing a sort of “instability” as the temperature then rapidly adjusts to the rapidly-changing fan speeds.

    Having a lower delta value will take the fans longer to response to a temp. change but it will tend to settle in a better manner.

    BTW, the Cosmos looks like a great case. I’ve been thinking of getting one; what are your thoughts on it?

  6. Thanks for the info. Yeah the Cosmos is a great case. A bit on the expensive side, but I got it for $165.99 after mail in rebate. Fans could be better but the computer overall is very quiet, I can barely hear it. A great change, from my old, mediocre mini dell tower. Very heavy though, not portable if you’re into LAN parties. Lots of space, simple and intuitive tooless design (except for motherboard etc.) The easy switch to open the side panel gets makes is the easiest panel opener I’ve ever seen. Case looks great too, good airflow, great design.

  7. Hi.

    I have noticed that i dont have the options in the speed tab. and even in the temperatures tab, it only mentiones CORE 1 AND CORE 2 nothing pertaining to my hard drive or anything, any help is appreciated, I own a hp pavillion dv6335ca laptop with dual core 1.7ghz processor with 1 gb or ram.

    Thanks

  8. Hi Robin,

    It may be that SpeedFan cannot detect or does not support hardware in your laptop… you could try upgrading to the latest version and see if that would help.

  9. Thanks for the guide! Helped a treat!!!

  10. my speedfan(newest version) does NOT look lik yours at all! so i cannot configure it-there’s no “minimum” or “maximum ” value buttons i downloaded right from the site argh

  11. Thank you for this guided, very helpful! :)

  12. @dee
    Do you have any pictures/screenshots of the new layout/UI?

  13. [...] hard Using SpeedFan to automatically control your PC’s fan speeds ? unitstep.net __________________ C2D E8400 – Asus P5QL-EM MATX Motherboard – OCZ Reaper 1066 DDr2 – Visiontek [...]

  14. How do you know which speed goes with which fan?

  15. I have an HP Pavilion ZD8000 laptop from 2005, and the newest version of Speedfan still can’t seem to detect the fans. When I hit “Configure,” there is nothing listed under the “Fans” or “Speeds” tabs. It does detect two temperatures, presumably the CPU and HD. Is Speedfan simply unable to detect some fans, or is there some other configuration I need to do first?

  16. @kevin
    You can open your computer and see which fans are connected to what fan power headers on the motherboard, and then tie that info back with what’s displayed in SpeedFan. Typically, the motherboard fan headers will be labeled `FAN1`, `FAN2`, etc.

    @Tim
    Unfortunately, some fans don’t report their speeds or do so in some non-standard way that SpeedFan is unable to read.

  17. I was afraid you’d say that. But thanks for the response regardless. Do you know of any other utilities that might have better luck?

  18. Does anyone know if this sort of program works for XP running under BootCamp on an Aluminum iMac (early 2008)…
    The SMBus on the iMac seems to be a hush hush secret, as that is where the “I’m an official Mac” query/response is found…or so I’m told.
    I just want to have something run the fans to cool off the iMac; the 8800GS and PwrSupply get mighty hot!
    (The built in algorithms don’t take into account a GPU that heats up faster than the CPU, nor does it pay attention to the PS.)
    I’ve re-written the Mac FanControl daemon, so all I need is some source to start from if you know where I might find that.
    I hear that there is a Keyboard override program for XP that also knows how to read the SMB…I’d love to get /that/ source… :-)

  19. Thanks for your answer to Tim on Feb.04/09, since my Fan tab is empty as well. In light of this, is there a good reason to keep Speedfan on my memory-taxed computer? Unless I’m file-sharing, all the readings are green checkmarks and blue down arrows. Occasionally something turns red up arrow, but only for a moment.

  20. Hi Peter

    I have just discovered your blog but i need your Urgent Assistance.
    I have a Packardbell Easynote Laptop. It heats to much. I have installed Speedfan on it. But trhough my readings i notice that only one line appears on the front sofware first page .Informations shown only related to the HD with flame sign . Could you help me to solve this problem. note HDD 51C.
    Have I the correct software version (4.37)

    Many thanks in advance

  21. Great article Peter! Would you happen to know how I can adjust the fans to run at a higher RPM that what it is currently using? @60% my cpu fan spins at 737 RPM, at 100% its at 1400 RPM. They are rated to work in the 1200-2800 RPM range. How can I adjust speedfan so that it will work in that range?

  22. I figured out what I needed to do to change the values. I had to go back to my BIOS settings and turn the SMART Fan Control Method to Disabled.

  23. [...] http://www.hardforum.com/showthread.php?t=1285260 http://unitstep.net/blog/2007/11/02/using-speedfan-to-automatically-control-your-pcs-fan-speeds [...]

  24. [...] Using SpeedFan to automatically control your PC fan speeds Posted by root 4 hours ago (http://unitstep.net) In most laptops like yours the cpu fan is already controlled it speeds up post a comment name required powered by wordpress hosted by site5 Discuss  |  Bury |  News | Using SpeedFan to automatically control your PC fan speeds [...]

  25. [...] Using SpeedFan to automatically control your PC fan speeds Posted by root 8 hours ago (http://unitstep.net) In most laptops like yours the cpu fan is already controlled it speeds up post a comment name required powered by wordpress hosted by site5 Discuss  |  Bury |  News | Using SpeedFan to automatically control your PC fan speeds [...]

  26. Hello,

    I installed Speedfan on my Acer Aspire SA80-ZB7Z. When I increase or decrease the fan speed,it works for 2 seconds and then the speed come back to his old value. So I believe that my hardware don’t have any problem, but this is automatically controlled and I would like to control by myself because the fan is often noisy and my computer is not hot. CPU max temperature is 51° while games, and 35° whith idle. It would be great if someone could help me. thx

  27. hello. this should be read!! read this all. i didnt want to admit i had a fan problem. i tried installing new drivers, updates, everything. i was too lazy to check. today, i opened up my computer and it was so dusty. but i still figured that had nothing to do with the fan problem. on one of my fans, i got to looking. my husband and i unscrewed the outer part of the fan, and i litterly to had to take a toothbrush, and clean all the built up gunk and dust inside. but, appearance, i saw the fan running. until i actually cleaned it out, did i realize there was absolutely no air getting in. then, i downloaded this. if your computer starts heating up, you can speed it up yourself. just for a second or two. when i plugged back in, my restarting for the past month, running fast for about six months, computer,,,, started working properly immediately. whether you want to or not, START by cleaning out that one fan on the inside. there are three on mine. just because they are spinning, doesnt mean air is actually getting through.

  28. question:
    just curious. my computer, has always started running really fast, when i open alot of windows, or run alot of programs. i’ll hear the fans speed up. however, for the past couple of weeks, it started shutting down. it was extremely hot, until i figured out it was the dust in the fan. since i fixed it today, it hasnt kicked on. actually i havent heard it spin up like that for about three or four days. even when it was restarting over and over. but, the report i ran with speedfan said everything appeared fine. should i be worried that it’s not speeding up at all? or could i have fixed it. the not speeding up at all before i cleaned it has me a little nervous. thanks.
    this is what it said
    The overall fitness for this drive is 97%.
    The overall performance for this drive is 91%.

    Spin Up Time 235 4918 Good
    Start/Stop Count 252 2717 Normal
    Reallocated Sector Count 253 0 Very good
    Read Channel Margin 253 0 Very good
    Seek Error Rate 253 0 Very good
    Seek Time Performance 250 53319 Very good
    Power On Hours Count 176 40771 Watch
    Warning: Power On Hours Count is below the average limits (194-252).
    Spin Retry Count 253 0 Very good
    Calibration Retry Count 253 0 Very good
    Power Cycle Count 247 2702 Good
    Power Off Retract Count 251 2555 Good
    Load Cycle Count 250 12718 Normal
    Hardware ECC Recovered 253 44616 Very good
    Reallocated Event Count 253 0 Very good
    Current Pending Sector 253 0 Very good
    Offline Uncorrectable Sector Count 253 0 Very good
    Ultra DMA CRC Error Rate 199 0 Very good
    Write Error Rate 253 0 Very good
    Soft Read Error Rate 253 0 Very good
    TA Increase Count 253 0 Very good
    Run Out Cancel 253 0 Very good
    Shock Count Write Opern 253 0 Very good
    Shock Rate Write Opern 253 0 Very good
    Spin High Current 253 0 Very good
    Spin Buzz 253 0 Very good
    Offline Seek Performance 165 0 Normal
    Unknown attribute 99 253 0 Very good
    Unknown attribute 100 253 0 Very good
    Unknown attribute 101 253 0 Very good

  29. I purchased my computer about six months ago its a HP PAVILION DV4 its a 2008 model i think. It has a very tiny fan and i recently downloaded speedfan 4.38 but it doesn’t show me the options to change the fans or the voltage it only reads the temperature of the 2 cores and when i go to configure option it just let me change the desired temperature and warning temperature and in the options tab y changed the delta values but it doesn’t cool down neither i see a change in temperature what should i do?

  30. [...] [...]

  31. Ausgezeichnete Gestaltung

  32. If the fans are always at 100% will do damage to the pc?

  33. @Daniel

    Leaving the fans at 100% all the time will not damage your PC or the fans. Typically case fans are meant to run at 100% (the default without SpeedFan usage) for something like >50,000 hours.

  34. @Peter chng

    Thank’s for ansewring my question.

  35. I have a M3A78-CM motherboard and i am trying to control my fan speed with no luck. I just downloaded Speedfan and getting ready to set it up. BUt i want to k n ow what Hypertransport is, my motherboard has it and wonder if i should turn it off also. The mobo is new and since i installed it the fan is loud, never was before. I am running Windoews Vista Home Premium and want to know if there are certain fan values i should consider or should i buy a new fan to go with the mobo.

  36. Thanks for the guide, it was very helpful. I was just using Speedfan to monitor CPU temperatue and see what the difference was with a new CPU fan. Its great to know about its ability to control fan speed and how to best implement it.

  37. Hey, ive switched everything off in temp except 1 so i can control 1 fan and not all. Though it wont change the RPM for that 1 fan (wich is spinning way too fast, but its just some sort of backup fan). Ive set the speed to 30% and max 40% but it doesnt do anything.. Is there a way to set the RPM manually to say like a 1000? I cant seem to find it in the controls.
    Got the latest Speedfan.

    Kind regards,

    Bram

  38. Hi,
    I’m struggling a bit even after reading the excellent tutorial. I have just built a Windows 7 proffesional machine with an old abit aa8xe board in it. The fans simply roar away the whole time irrespective of what settings I put in the bios or in speed fan. Whatever I do they don’t seem to change. Can anyone help!?!?!

  39. Thanks! Ideal situation for an old brick where the BIOS doesn’t want to handle this stuff for me! Great Tutorial!

  40. This programs great, get to watch he fan cpu and voltage. Gives you a good indicator when a new cpu fan is needed and if your having any cpu problem with voltage swings like i did with a older computer of mine. To the previous comments, Some mother boards have the ability to set your cpu fan in the bios. This program doesn’t work with all mother boards.

  41. hello all..
    does speedfan support Acer Aspire 9920G ?
    if yes..
    how can i obtain configuration file..
    thanks…

  42. go into configure/advance section and change pwm1 (fan1 control) from to software. then it works

  43. [...] to configure it first . this should help: http://www.overclock.net/air-cooling…-software.html http://unitstep.net/blog/2007/11/02/…cs-fan-speeds/ [...]

  44. [...] That can allow you to vary the speed of your fans. This is a good summary on how to use it. Using SpeedFan to automatically control your PC’s fan speeds unitstep.net Check in your BIOS to see what sort of settings you have available to control fan speeds. 2000rpm [...]

  45. Once again I decided to try speed-fan. Once again, it does nothing. At least nothing good. The fans always stay at 100% on auto, regardless of what i do. The temps don’t change… for a while, then they slowly start going up, very slowly and nothing i do changes it. Once again i have uninstalled speed-fan and once again i wish someone could explain to me the problem.

  46. Wow. Amazing guide, still works after about 3 years with Speedfan 4.41 B5. Thank you! Now my case is noice and quiet!

  47. Hi All, Great app just have one or two questions, firstly i hve a Asus P5n32-sli premium motherboard and on the readings page it says i have 9 fans installed, i’ve worked out that fan 1 was the CPU Fan and that fan 2 are the north and southbridge fans which is all fine and dandy but fans 3,4,5 i have no clue about as all the others are attatched to the power suply and can’t be altered through speefan (or at least not that i know of) Secondly the last four are listed as Another set of Fans 1 through 4 whoci is great as the second fan three is registering a speed of about 3000 RPM, the only thing is that to adjust the speed of the first two is reletively simple as they are linked to speed one and two so how do i link the last fan to speed three, four, five, or six?

  48. installed fine BUT as soon as i ran speedfan
    my cpu fan went from 450 500 to 3040 and i cant change any fan speeds or link temps and when i uninstall fan is still at full speed
    and system restore
    and i cant change anything in bios regards fan

    pentium d 3.2 ghz
    xp sp3
    nvidia 8600gts
    1gb ram
    250gb sata hdd
    Intel D945GPM Motherboard
    emc6d103 for my cpu

    is it voltages?
    has speedfan changed any default values anyware
    like config files ini of dll sorry mite be stupid question but

    help help please

  49. Speedfan is crap – unless you happen to fly helicopters.

    For fucks sake I want to adjust fan speeds not fly to the fucking moon.

    What is this crap? Can I do a degree course in how to use it?!!!

  50. I’m running an Intel 15 650 and an nvidia GE Force 320.

    I’m trying to set my temp values and feedback would be appreciated. I’ve reset GPU desired value to 90C because nvidia spec is max 105C

    I presume my temp 1 is CPU because it runs hotter than any other temp (except GPU).

    Intel spec is Tcase value of 72.6C. Does this mean i can set temp 1 value to say 65C ? (it seems to hover at around 60 at normal load).

    cheers

  51. [...] Speedfan is your best option if anything. take a look here: http://www.overclockers.com/speedfan/ http://unitstep.net/blog/2007/11/02/…cs-fan-speeds/ __________________ BACK FROM THE DARK SIDE We Are Gr33n Machine Desktop Validated Pics of my [...]

  52. have a laptop that I think needs some serious tune-up with the fan. It keeps spinning very fast every few minutes, which is very loud. I tried to configure speedfan to fix this problem, but only the temperatures of the hard drive and processor is detected. No fan RPM’s or voltages. It would be great if I could get some help…

    the first person wrote this and didnt get any answer. i have the same problem. please mail me!

  53. My problem is that i downloaded latest bios on my laptop and cant do shit with it. i opened speedfan and there is nothing to configure and no rpm showing etc. im totaly lost my comp is on 95degrees when i play and then the fans run on maybe 60%. i want them on 100% ALL TIME! please help.

  54. tis good

  55. [...] motherboard is a bit different, but here's a basic guide on using SpeedFan: http://unitstep.net/blog/2007/11/02/…cs-fan-speeds/ I don't think SpeedFan can control VGA fan speed though. [...]

  56. what is the best speedfan that we used>?

  57. it is ok that i use speedfan 4.42

  58. how to use speedfan 4.42 & what mean by
    red color arrow up HDO:46C

  59. Speed fan works great with my desktop computer, GPU down by 6C with laptops id advice you to use speedswitch to control the fan.

  60. Hey Peter, speedfan is working fantastically for me. Only thing is that I have to start the program every time following boot. Is there a way to configure auto start at bootup ?

    Thnx in advance, rolar72

  61. Hello,

    To make speedfan startup automatically:

    1. Create a shortcut for speedfan. Locate the shortcut.
    2. Do a windows search for a folder called SHELL:STARTUP.
    3. Drag the shortcut to the shell:startup folder.

    That’s it! You might also want to check the option in speedfan to have it start minimized.

    -Santos

  62. Also that shortcut tricks works for any program that you want to start up automatically.

  63. Thanx for quick response Santos,
    Running XP Professional. Search found no results even after opening hidden windows files. Typed exactly as you did in post. Search replies that SHELL: is not a valid file. Could you possibly specify the path to this file in a way that I would be certain to find it ?
    Just kinda scratchin my head here, lol.

  64. Thanx anyway,
    Got it runnin automatically now. Simply created shortcut on dsktop, dragged to start, dragged to and placed in startup file. Bingo !!! Runs at all my preconfigured settings…Automatically.

    Hope this may help others.

  65. i’ve just installed speedfan 4.43 and have got two labels which im not sure what they are one is ‘Core’ but i know its not my cpu and it reads 0c, and the other one is temp3 but that is reading -128c!!
    im running a phenom 1090t with asus formula IV mobo
    Any ideas

  66. Can SpeedFan adjust my fan when my fan has a 3 pin caseing and my mobo has a 4 pin? I understand that the 4th pin is used to control the speed by the mobo using pwm, but my fan doesn’t have a wire for that pin. Can I still control the speed of the fan… it is constantly running at 5000rpm’s and never slow’s down… too noisey.

  67. Jeff,

    I’m pretty sure you will need a 4-pin connector to get correct thermal and speed readings.

    You can always buy a 3 to 4 pin adapter which will work just as well. There’s even Molex -> 4 Pin as well. Try eBay.

  68. cool I didn’t know there was an adapter… I’ll look for that, thank you.

  69. I have speedfan 4.43, and both my fans run at 4K+ RPM. After about 5-10 minutes of extremely loud noise they will go back to around 2K RPM for about 20-30 seconds. How do I fix this, nothing in your guide actually works because in my “Speeds” tab nothing actually shows up there to configure. -_-

    My fans think my computer is overheating when it’s not, so they just spin at maximum speed. I can’t take the noise anymore. HELPPP :(

  70. Thanks

  71. can any answer my orginal question #65 and also how do i tell which fan is which my cpu,mobo,both hdd’s and gpu all have speed01 throu to 06 attached to them,speed01,02,03 have sensor pwm1,2,3 respectively but speed04,05,06 also have pwn1,2,3 as well only difference being the chip sb7xx/8xx PM2 and address $CCB being against speed01,02,03 and chip IT8721F and address $290 against speed04,05,06
    thanks

  72. i’ve just installed speedfan 4.43 and have got two labels which im not sure what they are one is ‘Core’ but i know its not my cpu and it reads 0c, and the other one is temp3 but that is reading -128c!nd also how do i tell which fan is which my cpu,mobo,both hdd’s and gpu all have speed01 throu to 06 attached to them,speed01,02,03 have sensor pwm1,2,3 respectively but speed04,05,06 also have pwn1,2,3 as well only difference being the chip sb7xx/8xx PM2 and address $CCB being against speed01,02,03 and chip IT8721F and address $290 against speed04,05,06

  73. @fruitbat Are those the only two temperature readings you get? What motherboard/CPU are you using?

  74. no i get other readings which are correct and are labelled as the correct component ie gpu and hard drives cpu and mobo, i am using a asus formula IV and 1090T amd cpu

  75. @fruitbat
    If you already have accurate readings for your CPU and so forth, I wouldn’t worry about those other readings.

    Typically, some motherboards have additional sensors that may be optional and/or not connected to read anything meaningful, so you can ignore them.

  76. great thank you any idea about my question on setting the fans and which is which?

  77. @fruitbat:
    Two questions:
    1. What speeds do sensor read?
    2. How many fans do you have in your case?

    Typically, (but not always!) the CPU fan spins faster than case fans. The only way to figure out which is which may be a trial and error approach or reading your motherboard’s manual.

  78. i have an acer aspire 5552g: amd phenom II x3, radeon 6470, and 500gb hard
    my hard temp is almost always about 35,and my cpu and other(it reads temp1 and is equal or -1°c lower than the cpu) , they are always 50, 50+ when the fans are not modified as you said above.
    the rpm always show 0 (all three of them), and the 3 speeds below change and always go to 100% in short period. did I do something wrong? the temperatures are ok, but what with the fans speed?

  79. All the material I

  80. im using an intel {R} pentium 4 … my pc shuts down unexpectedly and red light flashes … i’ve downloaded this software and noticed that “remote 2″ and “local” temps are high how can i decrease those temps … thanks

  81. [...] [...]

  82. SpeedFan couldn’t detect a FAN in my laptop (DELL XPS 1640). What might be the reason?

  83. #64, Thanks!

    Everytime computer wakes up or i have to reboot, my settings for speedfan resets. Putting it on the startup menu saved the day. Thanks because i have been playing with it a couple of days.

    Also, if you are not able to control your fans, you have to set the as software controlled in speedfan.

    Hopes this helps as #63 helped me.

  84. I have a Corsair H100 Watercooled set up on a MSI P67A-GD65 Board with a 2600K proc.

    I have been all over trying to figure a fan controller for the H100. For one the H100 is notorious for the all in one fan controller going out. Second on high the fans sound like a microwave, a loud one!

    Anyhow I stumbled over SpeedFan and suprised I forgot I’ve used it years ago. Peters blog was a timesaver as PeedFan isn’t exactly intuative with “Speeds” meaning fans etc. My question is everything now works great in SpeedFan as long as I use Sysfan 1 or 2, even works on my Asus HD6870 GPU. BUT it doesn’t work on the CPU fan header. Percentages show up, verified in CPUID HWMonitor. For instance set it at 25% in speedFan it shows up as such but the fans stay on high. I disabled smartfan in the MB bios but still does it. Any clues?

    Oh yeah! Here’s my post on Corsairs Forums about SpeedFan and Peters Blog http://forum.corsair.com/forums/showthread.php?p=528572#post528572.

  85. Just installed speedfan and trying to decipher what I see. Installed it because I thought I had an overheating issue – my computer was randomly shutting down. Then I got a “CMOS Checksum Bad”. As soon as I installed Speedfan, and then restarted, the fans took off and are constantly 4200-4500 rpm. I know they were on before, but I couldn’t really hear them, and can def. hear them now. Does Speedfan by default run your fans at 100%? And, unless the noise is too irritating, is it best to run your fans at 100%?

    While web browsing, this is what my values roughly show, and I’m not sure what they might be referring to, or if any are concerning:

    (green check) Temp 1: 39C
    (down arrow) Temp 2: 36C
    (bright flame) Temp 3: 60C
    (green check) HD0: 42C
    (down arrow) Core 0: 33C
    (down arrow) Core 1: 27C
    (down arrow) Core 2: 32C
    (down arrow) Core 3: 38C

    My Acer Quad Core was only running for a couple minutes before it shut down randomly earlier today…and after the speedfan install it hasn’t shut down for about an hour. I wonder if I should still do something about the SMOS thing…

    Thanks for any interpretation anyone can provide!
    Cheers

  86. There seems to be an extra step to setup now in the latest Speedfan! This is what I did to get things going properly.

    I’m using v4.44 and I noticed there is an extra tab in the ‘Configure’ window called ‘Fan Control’.

    In here tick ‘Advanced fan control’
    Click ‘ADD’ button to add a fan controller , name it ‘CPU’ for example.
    Highlight ‘CPU’ , tick ‘Controlled Speed’
    Pick one of your fans from the drop-down list , I used ‘Speed01′
    Now you will see a ‘Temperatures’ list , so click the ‘ADD’ button , a window will pop-up , pick a temperature , I added ‘Temp1′ which is my cpu.
    Now highlight this temperature and you will see a ‘response’ graph which Speedfan will use to variate the Fan speed!

    I’m just using this with a bit of trial and error at the moment, but it seems to work just fine!

    My CPU fan is no longer stuck at MAX speed … try it and see how you get on folks!!

  87. Thank you Peter!

    What a fantastic little program. I’d tried Speedfan some time ago and given up.

    Thanks to you and others here my machine is running tickity boo! I’m able to tie my case fans to my cpu and northbridge temps. I’m even able to use my cpu fan to help keep my northbridge temps down.

    Barry Bateman

  88. I’d like to be able to tie my case fan speeds to my core temps.

    This is working great with my exhaust fan hooked up to the sys fan 2 header on a GA-X58A-UD3R mobo. Unfortunately, of the six fan headers on this mobo, only two can be speed controlled – cpu and sys fan2. Two of the other four headers can be detected, but not controlled. And the final two can neither be detected nor controlled.

    I’m assuming that I’ll need a fan controller for these fans. Can anyone suggest a fan controller that works well with Speedfan. Can Speedfan detect sensor temp probes on this controller?

  89. Speedfan is just trash…..
    - doesnt boot up when windows starts
    - doesnt remember settings for fans
    - doesnt set fan speed to desired when speedfan starts
    - loading time of speedfan is to long.
    - speedfan always detect like 10 fans while i got 3, rest are all duplicates.

    Just buy a connector extender for the fan to let it rotate at lower volts…

    see pic:
    http://static.scan.co.uk/images/products/1020426-a.jpg

    best option u have if u cant configure it in the Bios.

  90. A very useful and informative page! I’d love to see ‘idiots guide’ on every program – whereby when one hovers over a button, it tells you what it does and what the implications are if you change a value etc.etc. Maybe you should do this Peter. I’d love to do it, but I’m one of those idiots!

  91. Answering Cotax’s post above …

    1 – doesnt boot up when windows starts … Yes it does!
    2 – doesnt remember settings for fans … Yes it does!
    3 – doesnt set fan speed to desired when speedfan starts … Yes it does!
    4 – - loading time of speedfan is to long … Possibly , but this is a subjective thing , It’s 20 seconds or so in my system , not a problem for me! Perhaps I’m not in that much of a rush?!
    5 – - speedfan always detect like 10 fans while i got 3, rest are all duplicates … This is true , but if you read the instructions , you will notice that it’s up to you to ‘filter’ out the irrelevant ones you don’t need. You did read the instructions I hope?

    The bottom line is Speedfan is a free program and no-one is forcing you to use it! If you do use it , at least take the time to set it up properly before you start whingeing about it!

    Happy New Year folks!!

  92. guys what about speedfan can’t read or found my laptop fans ..no fan speed appear to me i don’t know what i should do … the temp. reading all time over than 50 and it can up to 88 sometimes ,please can any one lead me to right way?

  93. SpeedFan is shit and this guide is worthless.

  94. This article is a masterpiece of clarity and has shown me exactly how to get the best from this software.
    THANK YOU!

  95. speedfan shows my cpu fan as 0rpm, my system is home built and I can see through the window that the fan is moving. problem is its full on. the fan in question is the original one mounted on the Zalman CNPS5X. has anybody else encountered this, or found a fix?

  96. KP said:

    “There seems to be an extra step to setup now in the latest Speedfan! This is what I did to get things going properly.

    I’m using v4.44 and I noticed there is an extra tab in the ‘Configure’ window called ‘Fan Control’.

    In here tick ‘Advanced fan control’
    Click ‘ADD’ button to add a fan controller , name it ‘CPU’ for example.
    Highlight ‘CPU’ , tick ‘Controlled Speed’
    Pick one of your fans from the drop-down list , I used ‘Speed01?
    Now you will see a ‘Temperatures’ list , so click the ‘ADD’ button , a window will pop-up , pick a temperature , I added ‘Temp1? which is my cpu.
    Now highlight this temperature and you will see a ‘response’ graph which Speedfan will use to variate the Fan speed!

    I’m just using this with a bit of trial and error at the moment, but it seems to work just fine!

    My CPU fan is no longer stuck at MAX speed … try it and see how you get on folks!!”

    ^Everything is here, you have to assign the fans to the temperatures sensors to activate automatic coontrol.
    Good job KP thanks.

  97. This article is well written and it helped me with my college work.
    Thanks :-)

  98. hi there i have just installed speed fan and all seems to be running ok except my “temp 3″ has a flame at the side of it and is at 127C what ever i do this temp does not change any ideas of what temp 3 is and how to solve it

  99. My GPU temp is over 90C (flame beside it). My Fan3 always sits at 0RPM. Could this be the cause of the overheating?

  100. One should remember Speedfan is robust enough for power users. That said, this article is appreciated for insight on more basic controls. I use the program to add previously non-existant fan controls to my Inspiron 546. I also use it with my gaming system to control the 3 pwm fans and leaving my 5 channel Sentry 2 to tame the 5 case fans. I would appreciate your take on fine tuning Advanced fan controls.

  101. overclocking maybe nice but it could destroy your PC in a matter of hours. :

    My own, personal web portal
    http://www.homeimprovementstuffs.com/why-you-should-use-eyelet-curtains/

  102. All you guys with laptops and hightowers, remember to clean your graphic card and processor fans from dust. This means you have to detach the fans carefully and blow on it and in some cases use a toothbrush or something to get into those small openings. Problems with overheating laptops is often due to accumulated dust infront of the suction. Clean that out and it ll be running nice and cool again.

  103. All you guys with laptops and hightowers, remember to clean your graphic card and processor fans from dust. This means you have to detach the fans carefully and blow on it and in some cases use a toothbrush or something to get into those small openings. Problems with overheating laptops is often due to accumulated dust infront of the suction. Clean that out and it ll be running nice and cool again. Don t forget to replace the cooling paste which you put on the processor so it wont get overheated. Sometimes it also helps to change the paste since alot of the times the old paste tends to completely dry up and crack into powder. I do this to my laptop and desktop computer every 3 to four months.

  104. hi,
    i have HP 4530s probook with extremly nois fan, i instal speedfan 4.46 but tabs speed and fan are empty without any information please help me

  105. I recommend you using RivaTuner to control your fan speed. Otherwise I think you may need to get a new fan if its making alot of noise.

    http://downloads.guru3d.com/download.php?det=163

  106. Yes I totally agree with you on that point. Desktop CPUs are practically for free ha :) many of them are so cheap.

  107. Old but gold! Just downloaded SpeedFan today and found your nice guide. Thank you, finally my computer is a little less noisy. :)

  108. my version no work totally.
    no show my speeds.

    :(

    help!

  109. This is way more complex than it needs to be. Every single guide is telling me how it works for them, but in my case it will be different so i just need to figure it out. That doesn’t help me, i would rather just set my fan speed manually to 100 since my smart motherboard which is supposed to control temperature and shit isn’t doing it’s job at all. No luck playing with bios either. Help me out i don’t want my computer to fry, my fans are going really slow and i been struggling with speedfan all day, i’m officially pissed off.Computer keeps restarting

  110. I installed Speedfan and my CPU fan went to 100% and hasn’t slowed down since. I’ve uninstall and reinstalled a couple dozen times and now I’m stuck. How do I get my default original settings back. The programmer Alfredo is useless and doesn’t want to help unless you are an electrical engineer. My fan is loud as hell and I want my original variable speed fan settings back. I’ve seen several people with this issue, specifically with the Super IO chip IT8728F, but no resolutions. any help from here would be appreciated.

  111. Very soon this site will be famous among all blogging visitors,
    due to it’s good articles

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  112. Is it possible to damage a computer with utility like SpeedFan?

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