Reduce CPU Fan Speed

Discussion in 'iMac' started by merf64, May 30, 2014.

  1. merf64 macrumors newbie

    May 30, 2014
    Looks like I messed something up when I was putting my iMac back together after replacing a faulty internal drive. I need something that will override the system CPU fan speed and let me reduce it (it is currently running at max speed). The programs I've found only override HDD and optical drive fan speeds. I've never been able to hear my CPU fan for the life of my mac, so I think just reducing the fan speed to medium should be perfectly safe.
  2. omvs macrumors 6502

    May 15, 2011
    This is the best I've found, and works under both OSX and Bootcamp. It allows you to slave a fan to a particular sensor, which I've used to kick on my GPU fans a bit earlier since my GPU seems a bit flakey.

    Not affiliated with Crystalidea - just a very happy user.

    If you run the apple diagnostics, it should tell you which sensor is having problems, though you might have to google the code to figure out which one its talking about.

    Could be a simple case of forgetting to have hooked a sensor back up, or a connector not in all the way.
  3. merf64 thread starter macrumors newbie

    May 30, 2014

    Great app! Thanks a lot. Works perfectly. I'll also look into what exactly is going on so I know what the problem is. Definitely don't want anything overheating due to my ignorance.

  4. monokitty macrumors regular

    Sep 16, 2011
    2009-2011 iMacs cannot have the drive replaced with a non-Apple OEM HDD; otherwise the sensor trips and the fan(s) go full-speed. The 2009-2010 iMacs can have their sensor cable replaced with one that works; the 2011 model cannot because the sensor is built into the SATA cable. Third-party HDD's do not have the Apple propriety firmware in them that the sensor connects with.
  5. Dionysus2112 macrumors newbie

    Jun 5, 2011
    Does that apply to the late 2013 imac as well?

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