Can 4850 iMac owners help find the cause of the freezing? Is it WiFi?

Discussion in 'iMac' started by avihappy, Apr 18, 2009.

  1. macrumors 6502

    avihappy

    Joined:
    Nov 15, 2006
    #1
    I'm using this thread to get various data on what may be causing these iMacs to fail.

    Theories Tested So Far:
    • Memory "MemVendorID" [FALSE, values same in freezing and non freezing iMacs]
    • drvincom and SG values [FALSE, it was inconsistent]
    • Manufacture Location [FALSE, all same factory]
    • Incorrect CPU fequency in hardware test [Probably Irrelevant]
    • WiFI bug theory (proposed by jebiwan) [TESTING, BUT LOOKING VERY GOOD]

    Could all iMac owners (including owners of those that work fine) do this test, then fill out this questionaire (the link is below)?

    TEST (broken iMac owners):
    • If you are using your broken iMac with WiFi on, do this test. If your iMac is broken and you don't use WiFi, just fill out the questionaire.
    • Try to use your iMac with Airport OFF (you can use ethernet).
    • If your iMac is broken, but it works fine with the WiFi off, this this test was "successful"
    • If it still freezes, then this test has failed.

    TEST (working iMac owners):
    • If you are not using your iMac with WiFi, then you should perform this test. If you are using WiFi and the iMac works, just fill out my questionaire.
    • Turn on the WiFI and connect to a network.
    • See if the iMac works or not.

    Questionaire:
    Go here to submit data in a form that I can use more easily: http://www.formspring.com/forms/?595815-QBzGirSBMT

    Others can view the submitted data here (make sure you select to view all columns): https://www.formspring.com/admin/data.php?595815dGKYXRw1oaK

    Thanks to all who contribute!
     
  2. macrumors member

    Joined:
    Apr 17, 2009
    #2
    iMac is freezing when under load - e.g. playing a game or watching a flash video.

    "ATY,MemVendorID" = <0600>
    | | | | | "ATY,MemRevisionID" = <0200>
     
  3. macrumors member

    Joined:
    Apr 9, 2009
    Location:
    Massachusetts USA
    #3
    Does your iMac have the freezing problem: (Answer YES or NO): NO [out of 8 days use so far]
    What is the number for "ATY,MemVendorID": (For example, 600): 600
    What is the number for "ATY,MemRevisionID": (For example, 100): 200
     
  4. macrumors regular

    Joined:
    Apr 12, 2007
    #4
    Does your iMac have the freezing problem: YES (5 times over three days)
    What is the number for "ATY,MemVendorID": 600
    What is the number for "ATY,MemRevisionID": 200
     
  5. macrumors newbie

    Joined:
    Apr 17, 2009
    #5
    Does your iMac have the freezing problem: (Answer YES or NO) YES
    What is the number for "ATY,MemVendorID": (For example, 600) 600
    What is the number for "ATY,MemRevisionID": (For example, 100) 200
     
  6. macrumors newbie

    Joined:
    Apr 18, 2009
    #6
    Does your iMac have the freezing problem: (Answer YES or NO) YES (12+x times in 2days)
    What is the number for "ATY,MemVendorID": (For example, 600) 600
    What is the number for "ATY,MemRevisionID": (For example, 100) 200
     
  7. macrumors 68030

    Joined:
    Jul 5, 2008
    Location:
    Thule GL @ the TOW
    #7
    ...you'd think with the delay for the release of this product the GPU should have been right from the start.

    This has got to be frustrating = expensive :apple: beta testers...
     
  8. thread starter macrumors 6502

    avihappy

    Joined:
    Nov 15, 2006
    #8
    While I understand that you are frustrated, this thread's only intention is to gather some raw data on these failing iMacs. There are other threads where you can vent...

    Thanks! :)
     
  9. macrumors regular

    Joined:
    Apr 19, 2009
    #9
    Does your iMac have the freezing problem: (Answer YES or NO): NO [out of 6 days use so far]
    What is the number for "ATY,MemVendorID": (For example, 600): 600
    What is the number for "ATY,MemRevisionID": (For example, 100): 200
     
  10. macrumors newbie

    d510r9

    Joined:
    Mar 3, 2009
    #10
    My iMac is a 2.93GHz 4850

    Does your iMac have the freezing problem: (Answer YES or NO): NO
    What is the number for "ATY,MemVendorID": (For example, 600): <0600>
    What is the number for "ATY,MemRevisionID": (For example, 100): <0200>
     
  11. macrumors 6502

    GonzoRob

    Joined:
    Sep 1, 2004
    #11
    perhaps it isn't the memory . could people with working imacs please use the command :

    ioreg -l | grep ATY

    put the results on pastebin.com and let us have a look ... it may be something else (my crashing imac is http://pastebin.com/m6eb9fc77)

    Also, it could also be the case that people with 'working' imacs simply haven't stress tested their GPU's hard enough as my mac is pretty stable when not under load.

    If you can run this app (http://www.daionet.gr.jp/~masa/rthdribl/) in windows boot camp for an hour (demo mode, full res, mull multisampling) then you're ok. If it freezes, you've got the same problem as the rest of us. Personally, I think it should be the standard test :)
     
  12. macrumors member

    Joined:
    Apr 17, 2009
  13. macrumors 6502

    GonzoRob

    Joined:
    Sep 1, 2004
    #13
    checked Sermon pastebin,

    The only two differences I can spot are :

    "ATY,SG" =
    my value : <08f01a47>
    your value : <08a0f646>

    and

    "ATY,drvincom" =

    my value : <8da6620000700347>
    your value : <8da662000050ff46>


    However I have a feeling that these values will be different the whole time :confused:
     
  14. macrumors newbie

    d510r9

    Joined:
    Mar 3, 2009
    #14

    I ran my 4850 in Windows 7 playing Crysis for a 5 hour straight session...high settings, 2xAA, dx10...not a single freeze.
     
  15. macrumors regular

    Joined:
    Apr 19, 2009
    #15
    Looks like it - jus checked another one and these values are different to ours.
     
  16. macrumors 6502

    GonzoRob

    Joined:
    Sep 1, 2004
    #16
    so, probably not the components clashing with the firmware then :(

    Guess it's just a batch of bad memory/chips
     
  17. macrumors 6502a

    Joined:
    Jul 23, 2008
  18. macrumors member

    Joined:
    Feb 16, 2009
    #18
    Does your iMac have the freezing problem: YES
    What is the number for "ATY,MemVendorID": 600
    What is the number for "ATY,MemRevisionID": 200
     
  19. thread starter macrumors 6502

    avihappy

    Joined:
    Nov 15, 2006
    #19
    This theory was too inconsistent, and I think it has been falsified.

     
  20. macrumors newbie

    Joined:
    Apr 19, 2009
    #20
    Broken iMac:

    http://pastebin.com/m496fb10e

    avihappy: looks like my results fit your guess too:

    "ATY,SG" = <08b01547>
    "ATY,drvincom" = <8de6610000e00047>
     
  21. macrumors newbie

    Joined:
    Apr 16, 2009
    Location:
    California
  22. macrumors newbie

    Joined:
    Mar 27, 2009
    #22
    My iMac is working, too, and also seems to fit the pattern, though my ATY,SG and ATY,drvincom both end not in "6" but rather in "6b"
     
  23. macrumors newbie

    Joined:
    Apr 18, 2009
    #23
  24. thread starter macrumors 6502

    avihappy

    Joined:
    Nov 15, 2006
    #24
    OBSIA's data makes me a little worried, but still want to see more data before trashing the theory.

    I have also realized that the "ATY,SG" variable is not very reliable, as I have seen multiple "working" iMacs that have it end in 6 (contrary to the theory).

    So I think that "ATY,drvincom" will be the variable I would pay more attention to. It has been rather reliable so far (the exeption being OBSIA, whose broken iMac ended had this end in 6).

    EDIT: OK, based on OBSIA and iMac4850User's data, I think I am ready to throw out my theory. Oh well. I think maybe now we can check for mfg location?
     
  25. macrumors newbie

    Joined:
    Apr 19, 2009
    #25
    Does your iMac have the freezing problem: YES (freezes when NOT under load :confused:)
    Pastebin.com Link: http://pastebin.com/m2a98419b

    "ATY,SG" = <08601447>
    "ATY,drvincom" = <8de6610000e0fc46>
     

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