Mac mini Aug 09 can't run 64 bit kernal :(

Discussion in 'Mac mini' started by Raima, Mar 4, 2010.

  1. Raima macrumors 6502

    Jan 21, 2010
    Hey everyone,

    My 2Ghz c2d Mac mini still can't run the 64bit kernal even tho it seems to have all the components to support 64bit processing.

    I thought this was something Apple determined which machines can and can't run 64 bit kernals.

    Does anyone know if this is going to be updated or it never will?
  2. turbineseaplane macrumors 68040


    Mar 19, 2008
    Doubt it.

    That was a bummer to me as well, but I suspect it won't be addressed as Apple would rather have you buy a new computer.
  3. scyon macrumors newbie

    Feb 22, 2010
    What are you doing on your mini that would benefit from the 64-bit kernel? (genuinely interested)
  4. Raima thread starter macrumors 6502

    Jan 21, 2010
    Multiple virtual instances using Vmware. Extra memory is always good.
  5. garthok macrumors newbie

    May 11, 2010
    there is another thread on this topic in the past but it didn't give what i consdered a good enough answer. you have to load a hex edited efi to permit K64 booting.
    there are instructions on that are close, but actually wrong for my system.
    if you don't know what you are doing or can't undo what you've done... don't try it.
    linked below is the efi file I am using, so follow the guide to learn how to use it on your early '09 and it's sure to allow you to boot K64. have not tested on anything other revision than my 2.0ghz c2d march '09 mac mini. proceed at your own risk
    I used the guide and a google translated version of this site
    the latter is actually much more accurate and they link to the file I posted above on another host.
  6. zmttoxics macrumors 65816


    May 20, 2008
    It is important to note that though you are not running the 64bit kernel, you are running with a 64bit memory subsystem. OS X has supported more then 4GB of ram for quite some time - if the hardware supported it. Your Mac Mini running the latest firmware supports 8GB of ram - regardless of booted kernel.
  7. Zortrium macrumors 6502

    Jun 23, 2003
    As the above poster noted, your 32-bit kernel isn't limiting you in any appreciable way. At this point in time, the only reason I've ever heard from people about why they run a 64-bit kernel that I actually believe is "because I can".
  8. garthok macrumors newbie

    May 11, 2010
    I ran some speed tests today comparing performance of 64bit apps in 64bit mode vs 32bit and there is really zero difference that I can tell. :D
    but if you need to check that your 64bit kexts are loading because you are a kernel dev, I am sure it's useful for that :p
  9. WilliamG macrumors G3

    Mar 29, 2008
    My Aug 09 Mac mini 2ghz is running 64bit just fine.. Not sure why yours isn't...

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