Lion shuts down using 16GB of Memory.

Discussion in 'Mac OS X Lion (10.7)' started by lariosme, Jul 24, 2011.

  1. lariosme macrumors newbie

    Jul 24, 2011
    I recently purchased 16GB of Corsair Memory (2x4 DDR3 1333MHz) on Amazon to prepare for Mac OS X Lion. When using Snow Leopard, my iMac had no issues addressing all 16GB. After installing Lion, my iMac is unable to operate longer than a few minutes before it shuts off. I've been doing quite an amount of research and I'm unable to find anyone w/ similar issues. Is this normal when upgrading to a new OS?

    27-inch, Mid 2010
    Processor: 3.2 GHz Intel Core i3
    Graphics: ATI Radeon HD 5670 512MB
  2. basher macrumors 6502


    May 27, 2011
    Glendale, AZ USA
    You might try swapping things around to run 8GB at a time to see if by chance on of the corsair memory modules went bad.
  3. yeah macrumors 6502a


    Jul 12, 2011
    You have a few problems:

    1) Your mac can't support 16GB of ram:eek:
    2) OSX Lion can't support that much because it was just released:eek:
    3) The ram is faulty:D
  4. SgtP3pp3r macrumors member

    Mar 29, 2011
    i'm having a similar issue with 8gb of ram.

    anyone else experiencing this on Lion?
  5. ayeying macrumors 601


    Dec 5, 2007
    Yay Area, CA
    I'm running with 8GB ram, no shut downs
  6. aldejesus macrumors regular

    Feb 3, 2011
    I'm also running Lion on 8gb of Ram, and no problems at all.
  7. crain300 macrumors member

    Oct 13, 2008
    I have 16 gig of ram in 2010 iMac and works great
  8. marsmissions macrumors 6502


    Jan 5, 2010
    Washington, US
    COMPLETELY incorrect.
  9. DewGuy1999 macrumors 68040


    Jan 25, 2009
    In the past different versions of OS X have had different levels of compatibility with RAM. It's quite possible that Lion is having compatibility issues with that particular RAM. Can you get it exchanged?
  10. agentphish macrumors 65816


    Sep 7, 2004
    Good chance you have bad RAM. Have seen this before, but it's certainly not OS specific. I would bet you if you installed Snow Leopard again you'd have the same issues.

    You could try booting to single user mode and getting something like Rember to try testing your RAM.

    You could also take your iMac to the Genius bar and ask them to run extended RAM testing on your machine overnight to check for RAM issues/shutdowns.
  11. gentlefury macrumors 68030

    Jul 21, 2011
    Los Angeles, CA
    iMac can support up to 16GB ram....Mac Pro can go up to 32GB.
  12. Prezton macrumors newbie

    Sep 2, 2010
    Mid June 2010 i3 and 16Gb RAM Issues

    Well myself personally am having all sorts of dilemmas since upgrading to 10.7. Some issues have been resolved and others not. Been on the phone the Apple Developers having a cry lol as I've managed to locate quite a few major bugs.

    Any late model iMac from mid 2010 onwards can support 16Gb RAM, mine does and worked with SL 10.6.8. It's things like Pro-Tools that are only 32bit Apps that cannot access pass 4Gb RAM even if you do have have large memory.

    As for an upgrade vs clean install, there is no real difference except you may have issues with MAIL and a few other things, other wise I would stick to an Archive Install.

    I tried the Clean Install to see wether my issues would go away, but unfortunately not to be.

    Also as I pointed out to Apple, a possible oversight they may not have foreseen is user configurations that could cause issues. Myself personally have graphics tablets, recording gear etc hanging off the iMac, maybe that's a factor whom knows.

    Also if you notice with SL 10.6.8 the system overheads to run the system was 1.08Gb and with Lion 10.7 it's 3.8Gb… Whopping difference. Now I am wondering wether the Virtual Page Swap File may be causing issues.

    I Guess time will tell, just blinking annoying I've had to go back to 10.6.8 as Pro-Tools HD is not Lion Compatible
  13. lariosme thread starter macrumors newbie

    Jul 24, 2011
    Thanks for all the replies everyone!

    After some LONG process of elimination, my iMac has no issues running any combination of sticks of Corsair memory. It does, however, shut down if it totals 16GB of memory, something I NEVER had an issue w/ running Snow Leopard. The only possible theory is that Mac OS X Lion is unable to support 16GB of memory due to it's early stages of release. I currently took it down to 12GB for the time being.

    Thanks again.
  14. Peruvian macrumors regular


    Jun 10, 2006
    Ok, updated OSX to Lion with 4gb ram, no issues to report..

    Then today I upgraded my ram to 8gb and have had kernal panic on start up, Freezes, when wake from sleep..

    Odd thing is, Ive tested the ram in my other machine and all is fine.. In current machine I ran tests with rember and all have come out clean with no ram problems and in system report it says its ok..

    So what is causing the problems?
    Machine in question is Macbook pro 13 mid 2009 (which says 8gb is compatible)
  15. vslo macrumors regular

    Jul 9, 2010
    I am experiencing the same issue. I got a mid 2010 base model 21.5 iMac. I bought 2x2gb 1333mhz Kingston ram and installed. After 1 day of usage, the iMac frozen and started to make does 3 beeps that indicate memory fault. I started testing module by module and slot by slot. A day of testing: All fine. Then, I decided to try 6GB and now its smooth. Tested 6GB with other combinations of modules and slots and all went fine.
    I decided to try again with the 8GB, and it frozen again and again and again. I made several tests and was able to reproduce the problem easily with 8GB.
    So it must be some kind of instability with 8gb or 16gb or using all the 4 memory slots.
    There is a thread in Apple Forums with many people complaining about the exact same thing. Some of them got their logic board replaced and one guy even got a new iMac, but the problem persisted.
    So they concluded that its better to use 6gb than nothing.
    I am using it right now and Lion is running nice.
  16. swamyg1 macrumors regular

    Dec 11, 2007
    I'm also having a problem with 8gb... Coming off of Snow Leopard. My mac maxes out at 7.9x gb's of mem and then my machine freezes up.

    IT's very frustrating. As I type this I'm at 5.79GB and I hardly have many apps open... 1 small file in Photoshop, Paralells, nothing else overly obvious in atmonitor.

    I'm shocked at the difference in performance. I can barely work on my machine anymore!

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