Mac Pro fan control story

Discussion in 'Mac Pro' started by Schroedinger, Apr 4, 2007.

  1. Schroedinger macrumors regular

    Schroedinger

    Joined:
    Feb 12, 2004
    Location:
    Baltimore, MD
    #1
    I'm throwing this story out there in case anybody is thinking about any of these issues.

    I installed the latest version of smcFanControl on my mac pro. I had been using temperature monitoring software to keep track of the temp of the processors and 4 internal harddrives (two set up in a RAID).

    The harddrives had been running between 45 and 50 Celsius, even at idle, and this seemed a little high to me based on what information I could find on the topic of harddrive heat and lifespan.

    So, I installed the fan control software. Instead of the normal fan speed of 500 RPM i've got it running at 1000 RPM (as a minimum), which is just a little louder, but does amazing things to the temps. If i'm pushing the system at all, such as watching HD movies off the RAID (while de-interlacing the video), I'll push up the fan speed to 1500, which is still quiet enough not to be a bother.

    The drives are now running around 30C even at a good load. Not good with the Ferenheit Celsius conversion off the top of my head, but I think that is pretty much ambient room temperature.

    I was less worried under about the CPUs, but even under full load for all 4 cores (running Rosetta@home) they are running about 10-15 degrees Celsius cooler.

    With the software, you can set the minimum fan speed up to 3000 RPM, which doesn't seem to get much more of a cooling gain, and sounds like a jet engine, so I don't really use that setting.
     
  2. netnothing macrumors 68040

    netnothing

    Joined:
    Mar 13, 2007
    Location:
    NH
    #2
    How about your memory temps? What are you running for memory?

    Hs your Mac Pro ever kicked up the fans on it's own?

    I just installed 2 GB of Crucial RAM and they tend to hover around 56-62 Celsius. Mac Pro never kicks the fans on.

    -Kevin
     
  3. osx-linux macrumors member

    Joined:
    Apr 4, 2007
    #3
    That's some good info there for me. Thanks for sharing!

    Was wondering how loud the fans would get if cranked up a bit. :)
     
  4. synth3tik macrumors 68040

    synth3tik

    Joined:
    Oct 11, 2006
    Location:
    Minneapolis, MN
    #4
    I had smsfancontrol for my mac pro but got rid of it as I didn't like having the fans running at 1,000. I have installed 4G of RAM 4X512mb Apple and 2X1G from OWC. after the install of all the RAM my Fans now run a 600rpm instead of 500rpm and my RAM is around 150F or 66C.
     
  5. Schroedinger thread starter macrumors regular

    Schroedinger

    Joined:
    Feb 12, 2004
    Location:
    Baltimore, MD
    #5
    I hadn't looked at RAM temps, but will take a look now. The Mac Pro never sped up the fans on its own, at least not such that I'd notice. My sense is that Apple is more comfortable with higher temps in the case than I am. Perhaps they place a greater priority on a quieter system.
     
  6. DEXTERITY macrumors 6502a

    Joined:
    Aug 14, 2004
    #6
    I've been reading the fan issue posts. I 'm getting a mac pro as soon as apple ships it. Are there fan/heat issues or is there something I should do to control the heat? I've new to the mac pro (had dual g5) so I'm trying to get caught up on whatever issues I need to be aware of and how to resolve them or keep any problems from arising.

    thanks ...
     
  7. Father Jack macrumors 68020

    Father Jack

    Joined:
    Jan 1, 2007
    Location:
    Ireland
    #7
    I have never heard my 2.66 MHz Mac Pro fans speed up either.

    CPU A processor temp is 32 C
    CPU B processor temp is 34 C

    I have all ram slots filled
    Mem module 57 C
    Mem module 58 C
    Mem module 62 C
    Mem module 68 C

    Fan 0 500 rpm
    Fan 1 500 rpm
    Fan 2 600 rpm
    Fan 3 650 rpm

    FJ
     
  8. netnothing macrumors 68040

    netnothing

    Joined:
    Mar 13, 2007
    Location:
    NH
    #8
    I think that's exactly it. It think Apple set the fan threshold limits really high. I'm glad there is smcFanControl so that we can adjust fans manually (although I really do think we should have to).

    For the most part I haven't had any problems with the head. Only if I run Rember or do something processor/memory intensive was I getting some ECC Errors on the OWC RAM I installed. But then again, the temps were getting into the 170F range for the OWC RAM.

    I'm running Crucial RAM now and haven't had any ECC Errors.

    -Kevin
     
  9. davepk macrumors member

    Joined:
    Nov 20, 2006
    #9

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