Memory Test

Discussion in 'Mac mini' started by etsi, Dec 2, 2011.

  1. etsi macrumors regular

    Joined:
    Oct 23, 2011
    #1
    Hello,

    How can I test my memory to check if it's bad?
     
  2. zodiaque macrumors member

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    Sep 17, 2011
    Location:
    Belgium
  3. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #3
    Thanks but can I boot with a usb disk and memtest?
     
  4. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #4
    When your Mac boots up, it automatically performs a memory test. If memory failed that test, it would show less memory than you have installed, or wouldn't boot up at all.

    http://support.apple.com/kb/ht1547
     
  5. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #5
    That's not enough, on pc I use memtest I am trying to find a way how to use it in single user mode.
     
  6. zodiaque macrumors member

    Joined:
    Sep 17, 2011
    Location:
    Belgium
    #6
    mount the .iso on a disk and boot from the disk pressing alt during booting
     
  7. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #7
    Thanks

    Installed applejack and run it from recovery console.

    Memtest version 4.22 (64-bit)
    Copyright (C) 2004 Charles Cazabon
    Copyright (C) 2004-2008 Tony Scaminaci (Macintosh port)
    Licensed under the GNU General Public License version 2 only

    NOTE: No command-line arguments have been specified
    Using defaults: Test all available memory, one test pass, no logfile

    Mac OS X 10.7.2 (11C74) running in multiuser mode
    Memory Page Size: 4096
    System has 8 Intel core(s) with SSE
    Requested memory: 7228MB (7579443200 bytes)
    Available memory: 7228MB (7579443200 bytes)
    Allocated memory: 7228MB (7579443200 bytes) at local address 0x0000000101000000
    Attempting memory lock... locked successfully
    Partitioning memory into 2 comparison buffers...
    Buffer A: 3614MB (3789721600 bytes) starts at local address 0x0000000101000000
    Buffer B: 3614MB (3789721600 bytes) starts at local address 0x00000001e2e29000

    Running 1 test sequence... (CTRL-C to quit)

    Test sequence 1 of 1:

    Running tests on full 7228MB region...
    Stuck Address : ok
    Linear PRN : ok
    Running comparison tests using 3614MB buffers...
    Random Value : ok
    Compare XOR : ok
    Compare SUB : ok
    Compare MUL : ok
    Compare DIV : ok
    Compare OR : ok
    Compare AND : ok
    Sequential Increment: ok
    Solid Bits : ok
    Block Sequential : ok
    Checkerboard : ok
    Bit Spread : ok
    Bit Flip : ok
    Walking Ones : ok
    Walking Zeroes : ok

    All tests passed! Execution time: 4430 seconds.
     
  8. shortcut3d macrumors 65816

    Joined:
    Aug 24, 2011
    #8
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

    You can run Rember in OSX.
     
  9. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #9
    Rember is not using all the memory for testing.

    Also it displayed an error I will post it later. But I am wondering if mem86test is ok why Rember displayed an error?
     
  10. shortcut3d macrumors 65816

    Joined:
    Aug 24, 2011
    #10
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

    That is very interesting because Rember is supposedly just a GUI interface for memtest.
     
  11. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #11
    I think it's an older version of memtest under Rember.

    I will post the error later, very strange.
     
  12. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #12
    Rember:


    Memtest version 4.22 (64-bit)
    Copyright (C) 2004 Charles Cazabon
    Copyright (C) 2004-2008 Tony Scaminaci (Macintosh port)
    Licensed under the GNU General Public License version 2 only

    Mac OS X Server 10.7.2 (11C74) running in multiuser mode
    Memory Page Size: 4096
    System has 8 Intel core(s) with SSE
    Requested memory: 6214MB (6516879360 bytes)
    Available memory: 6214MB (6516879360 bytes)
    Allocated memory: 6214MB (6516879360 bytes) at local address 0x0000000101000000
    Attempting memory lock... locked successfully
    Partitioning memory into 2 comparison buffers...
    Buffer A: 3107MB (3258439680 bytes) starts at local address 0x0000000101000000
    Buffer B: 3107MB (3258439680 bytes) starts at local address 0x00000001c337d800

    Running 1 test sequence... (CTRL-C to quit)

    (big output not included)

    Running tests on full 6214MB region...
    FAILURE! Data mismatch at local BUFA address 0x00000001209fc0c0, BUFB address 0x00000001e2d798c0
    BUFA Data: 0xffffffffffbfffdf, BUFB Data: 0xffffffffffbfffff



    Memory is Kingston HyperX DDR3 1866MHz CL11

    Do you think is bad memory or a problem with 1866Mhz ???

    I will test again the default 4GB with Rember
     
  13. shortcut3d macrumors 65816

    Joined:
    Aug 24, 2011
    #13
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

    When I run Rember on 1866MHz it does not return any errors.
     
  14. etsi thread starter macrumors regular

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    Oct 23, 2011
    #14
    Ok thanks I will some more test and I think I will return the memory.
     
  15. jon08 macrumors 65816

    Joined:
    Nov 14, 2008
    #15
    ^^ Did you end up returning it then? I'm getting similar errors with my 8GB Corsair RAM (Macbook Pro), so I guess it's faulty?
     
  16. Shrink macrumors G3

    Shrink

    Joined:
    Feb 26, 2011
    Location:
    New England, USA
    #16
    Ok, this how bad off I am. When I read your post, I thought you were referring to a memory test to evaluate memory loss in relation to Alzheimer's or other forms of dementia.

    I was reading the thread to see if I could down load a test to use on myself! :eek: :p

    It was only when I saw GGJstudio's avatar that I realized my mindless error.

    Time to lie down, I think...:eek: :D
     
  17. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #17
    Yes I have returned it and I am thinking to buy 16 GB @ 1333Mhz instead.

    I was getting random errors with any test I run and system crashed several times when I used almost the whole memory.
     
  18. jon08 macrumors 65816

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    Nov 14, 2008
  19. philipma1957 macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    Location:
    Howell, New Jersey
    #19
    it is not the ram I just ran the same ram test on a 2011 mac mini with 2 sticks of 4gb ram got the same results the ram was gskill 1333. something else is up. I think apple's efi firmware may have caused both remember and memtest to run bad. I have a house full of mini's and ram I will do a lot of testing on this.
     
  20. etsi thread starter macrumors regular

    Joined:
    Oct 23, 2011
    #20
    In my case the tests never showed any errors with the default memory that was installed in mac mini.
     
  21. philipma1957 macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    Location:
    Howell, New Jersey
    #21
    I tested six sets of ram today including the oem samsung. all failed with the exact same error yours did.. I then thought maybe the mini is bad, but when I lifted it up it was really warm. so I download free istat widget and low and behold the fan was at 0. I opened the mini and looked at the fan plus and it was ever so slightly popped up.

    I pushed it down and all six sets of ram passed. I figure it was not fully snapped in at the factory the contact was intermittent this was cause of the bad ram tests. Since I mod and sell on ebay 2 to 4 minis a week this is the third one out of 50 plus with the loose fan. The other two the plug was really loose and easy to see. I am glad I test the minis before sending them out.
     

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