Older iMac: keep upgrading OS?

Discussion in 'iMac' started by Ben777, Nov 12, 2018.

  1. Ben777 macrumors member


    Jun 24, 2013

    Is it OK to keep upgrading OS with iMac 2012?

    Up untill now I kept upgrading. Would you do that, or rather stay with earlier OS? Which one? How would it impact performance?

    Thanks a lot!
  2. iTurbo macrumors regular

    Sep 9, 2008
    I'm in the same boat. I have a '12 27" iMac that runs High Sierra now. I tried to upgrade to Mojave, but there is a problem with the original Fusion drive that I'm not sure I'll be able to fix. Mojave refused to install.

    My conclusion was that if I can indeed fix the Fusion drive, I'll keep it running HS. If I gotta tear into it and install an SSD to replace the Fusion, I'll upgrade to Mojave.
  3. padams35 macrumors regular

    Nov 10, 2016
    Most OS upgrades are at least marginally slower on older hardware, so at some point you have to quit while ahead. My personal rule of thumb is to stop upgrading two years before you would need/want to replace the computer anyway.

    For my 2011 iMac that point was Sierra. Sure I probably wouldn't have had any issue with HS, but I was planning on replacing the computer within two years (now within a year) anyway and decided it was worth it to lock in end-life stability.

    For a 2012 I wouldn't have though High Sierra should be the end of the line, but Mojave might be. If you have any doubts just wait until Spring and check if any early adapters have posted problems and then make an extra backup beforehand if you go ahead and upgrade.
  4. Ben777 thread starter macrumors member


    Jun 24, 2013
  5. motulist macrumors 601


    Dec 2, 2003
    On a computer (as opposed to iOS) you can always reinstall an earlier OS version. So you can install the new version, see if it's good, and if it isn't good then you can just go back to the older OS.
  6. alien3dx macrumors 6502a


    Feb 12, 2017
    don't mojave unless needed like me.
  7. Ben777 thread starter macrumors member


    Jun 24, 2013
  8. Fishrrman macrumors P6


    Feb 20, 2009
    What version of the OS are you running -now-?

    How well is it running for you?

    Do you have any compelling reason to upgrade at this time?
  9. Ben777 thread starter macrumors member


    Jun 24, 2013
    I upgraded to Mojave, and everything seems working slower. I noticed some slowing down with High Sierra too.

    Well, it takes the longest to load applications.

    But... maybe I just could move OS and all applications to external SSD drive and then there is no need to degrade OS?
  10. nambuccaheadsau macrumors 68000


    Oct 19, 2007
    Nambucca Heads Australia
    If the 2012 iMac has a slow old 5400rpm laptop style platter drive installed suggest leaving it at Sierra OS X.12. If an SSD go with Mojave.

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