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smcFanControl 2.1- good or bad ?

4189 Views 17 Replies Latest reply: Nov 2, 2008 4:44 AM by JustCallMe Dude RSS
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JustCallMe Dude Level 2 Level 2 (240 points)
Currently Being Moderated
Oct 31, 2008 3:26 PM
Hello all

First of all , I'll not make the claim to be a " Know it all " when it comes down to computer temperatures, Thus the reason for my posting. I have noticed that my IMac always seems to run a bit on the hot side, so I tried googling normal temps and, what one should do. Seems no matter where and or what I read, I get mixed, incorrect and or conflicting information.

Last night I noticed my temp running a bit high so , I installed and used smcFanControl 2.1 , Now it did what it said and dropped my temp. But, when I did more homework I'm reading this app will cause unneeded wear on my fans,

So know to me it all seems very debatable and, I'm hoping to find the truth of the matter.

Here is my temps from what I first jumped on my Imac
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And here are my temps after about an hour
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Now if I'm running a demanding app such as Final Cut Express it will get warmer yet.

So I suppose my question is ,

Is there a set of ideal temperatures ?
If so, what are they ?
Would it be best to only run samFanControl, when running demanding apps ?

Thank you all in advance as I make my way through this lack of understanding and , Now confusing issue. If I even have an issue...
24" Imac 2.4 GHz Intel Core 2 Duo 3GB RAM, Mac OS X (10.5.4)
  • Kenichi Watanabe Level 7 Level 7 (30,010 points)
    Currently Being Moderated
    Oct 31, 2008 4:19 PM (in response to JustCallMe Dude)
    Just installing smcFanControl won't make any changes to the fan settings. The default setting just uses Apple's settings.

    I have it installed because I like seeing the temp in the menu bar. I have never altered the settings. I think it is best to stick with Apple's settings. They did the hardware design and determined when the fan speed should change.
    Various including Intel iMac, Power Mac G5, Pismo w/G4, Power Mac 8100 w/G3, Mac OS X (10.5.5), also Mac OS X 10.4.11, Mac OS X 10.3.9, and Mac OS 9.x
  • George Peters Level 4 Level 4 (3,165 points)
    Currently Being Moderated
    Nov 1, 2008 1:45 AM (in response to JustCallMe Dude)
    When you ask this kind of question all you will get are opinions because Apple has not officially posted any kind of "normal" internal temperature ranges. All we have to go by are what people post. From my experience your temps are not that bad as I have seen a lot worse. However I am still an advocate of using SMCFC to keep temperatures lower. The goal when using the fan controller is to only increase the fans as much as you need to keep the temps where you want them to be. This can usually be done by increasing the fans only a couple hundred rmp. The way I see it the fans are there to keep your iMac cool and if they wear out faster because of it then so be it. I would much rather have to replace my fans when they burn out then to have a power supply or hard drive failure.

    If you want my opinion on temperatures I would say keep the hard drive under 50C, Power Supply under 60C, and GPU components under 55C. For your iMac, judging by the temps you posted, a fan setting of ODD: 1000, HDD: 1500, and CPU: 1500 should be more than enough. Have a look at this topic for reference: http://discussions.apple.com/message.jspa?messageID=8346538#8346538

    George
    iMac 24" 2.33GHz 7600GT, ALU 20" 2.0GHz, Mac OS X (10.5.5), xserve G5
  • pogster Level 2 Level 2 (350 points)
    Currently Being Moderated
    Nov 1, 2008 7:53 AM (in response to JustCallMe Dude)
    If you don't trust Apple's fan control then install the smc override and crank up the fans.
    Intel 2.66 iMac, 500GB TC, wireless al kb, 1st gen touch, 2nd gen shuffle, Mac OS X (10.5.5)
  • musashi88 Level 2 Level 2 (455 points)
    Currently Being Moderated
    Nov 1, 2008 8:15 AM (in response to JustCallMe Dude)
    Hi Dude
    I use SMC. When your Power Supply Position 1 reaches 85ºC when playing a game and your mac fans do not ramp up, I kind of like to take control. The factory settings are not keeping my mac cool. I like to keep my temps close to George's. I like Temperature Monitor. It warns you when it gets hot.
    Kenichi, if your imac stays cool, (under 60ºC-70ºC) using the factory settings fans normally, great! Mine doesn't.
    iMac 2.4 GHZ Alum 20", Mac OS X (10.5.5), Macbook 13.3"(early 2008), iMac 2006 Intel 17" (W8)1.8GHZ, iPod Touch
  • den.thed Level 7 Level 7 (23,430 points)
    Currently Being Moderated
    Nov 1, 2008 9:21 AM (in response to JustCallMe Dude)
    Hey Dude

    I also think your safe using smc in moderation, common sense say's that running the fans real fast is bad plus it causes them to suck up more dust.

    The GPU Diode in my Jan 2006 17" Early Core Duo normally runs way up into the 165-175F range. For over 2 years I've used the smcFanControl to run the CPU and HD fans a few hundred rpms faster than Apples default speeds and my GPU Diode temp. now holds around the 145- 155F range.

    Dennis
    Early 17" Intel Core Duo -2GB Ram-, Mac OS X (10.5.5), - 2 Maxtor FireWire HD's - 2G Nano
  • George Peters Level 4 Level 4 (3,165 points)
    Currently Being Moderated
    Nov 1, 2008 11:51 AM (in response to JustCallMe Dude)
    Open up a Terminal window and type this: /usr/sbin/ioreg -lw0 | grep CPUBrand

    George
    iMac 24" 2.33GHz 7600GT, ALU 20" 2.0GHz, Mac OS X (10.5.5), xserve G5
  • elmac Level 5 Level 5 (4,230 points)
    Currently Being Moderated
    Nov 1, 2008 1:06 PM (in response to JustCallMe Dude)
    Hi, wear is relative:- heat = wear/faster speeds to cool = wear
    My intel has run without problems "out of the Box' from day one.
    2 days ago my fans boosted to High" - No Reason as far as I'm concerned.
    After doing the SMC reset & all was good. I then d/loaded iStat & SMC FanControl,
    I will watch things for awhile..I'm NOT changing any speeds etc..just monitoring etc..L
    Two bits of wire & an Apple!, Mac OS X (10.4.11), Back Up - 2 Secretaries writing furiously!
  • George Peters Level 4 Level 4 (3,165 points)
    Currently Being Moderated
    Nov 1, 2008 4:08 PM (in response to JustCallMe Dude)
    JustCallMe Dude wrote:
    Cranking the fans up just for the general purpose of running it cooler would be > pointless if, your machine and it's inner components can handle those
    temps.


    Not necessarily. I think one thing missing here is that all the internal components are perfectly capable and rated to handle the temperatures we are seeing. However the thing is for instance can we expect the hard drive to last it's full MBTU by running just under it's maximum rated temperature? The answer is no. Also the fans are not necessarily rated to outlast the life span of the hardware anyway. Average hard drives are usually rated to run about 500,000 hours or more and a regular CPU fan is only rated to run about 50,000 hours. IMHO 300RPMs for 10C lower temps overall is quite worth it.

    The way Apple approaches this subject is if it's not broke then don't fix it. But if your machine fails while under warranty then they will fix it. They choose to not have their customers worrying about technical things like internal temperatures and I can see why.

    George
    iMac 24" 2.33GHz 7600GT, ALU 20" 2.0GHz, Mac OS X (10.5.5), xserve G5
  • elmac Level 5 Level 5 (4,230 points)
    Currently Being Moderated
    Nov 1, 2008 5:28 PM (in response to JustCallMe Dude)
    Hi, well, luckily you now have the ability to speed up your fans..Apple, You, David & a host of other users will always use Mac's, good bad or indifferent, as we all feel at times about them.
    They are a great computing experience..shortcomings notwithstanding...L.
    Two bits of wire & an Apple!, Mac OS X (10.4.11), Back Up - 2 Secretaries writing furiously!
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