Inconsistent Memtest Results (Multiuser, Single User Modes)

Discussion in 'iMac' started by Presence, Jan 21, 2011.

  1. Presence macrumors newbie

    Joined:
    Jan 21, 2011
    #1
    Bought a 2gb ram stick off crucial.com for my iMac G5. I ran memtest (as I always do for new sticks of ram). It passed the test several times in SUM, however when running it in multiuser mode, it will always fail. Here's the logs:

    Multiuser:
    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 10.5.8 (9L31a) running in multiuser mode
    Memory Page Size: 4096
    System has 1 PPC processors(s) with Altivec
    Requested memory: 2274MB (2384531456 bytes)
    Available memory: 2274MB (2384531456 bytes)
    Allocated memory: 2274MB (2384531456 bytes) at local address 0x0000000001000000
    Attempting memory lock... locked successfully
    Partitioning memory into 2 comparison buffers...
    Buffer A: 1137MB (1192265728 bytes) starts at local address 0x0000000001000000
    Buffer B: 1137MB (1192265728 bytes) starts at local address 0x0000000048108800

    Running 5 test sequences... (CTRL-C to quit)

    Test sequence 1 of 5:

    Running tests on full 2274MB region...
    Stuck Address : ok
    Linear PRN : testing 1 of 16

    FAILURE! Data mismatch at local address 0x00000000197fd690
    Expected Data: 0x77dad868efe2ac3c, Actual Data: 0x77ded868efe2ac3c

    Running comparison tests using 1137MB buffers...
    Random Value : ok
    Compare XOR : ok
    Compare SUB :

    FAILURE! Data mismatch at local BUFA address 0x00000000197fd690, BUFB address 0x0000000060905e90
    BUFA Data: 0xb9c74c6f27152cc6, BUFB Data: 0xb9c34c6f27152cc6

    Compare MUL :

    FAILURE! Data mismatch at local BUFA address 0x00000000197fd690, BUFB address 0x0000000060905e90
    BUFA Data: 0x2234f332b5a3726a, BUFB Data: 0xbc18f332b5a3726a

    Compare DIV :

    FAILURE! Data mismatch at local BUFA address 0x00000000197fd690, BUFB address 0x0000000060905e90
    BUFA Data: 0x0000000000000000, BUFB Data: 0x0000000000000002

    Compare OR :

    FAILURE! Data mismatch at local BUFA address 0x00000000197fd690, BUFB address 0x0000000060905e90
    BUFA Data: 0xfffd4a727a6f4569, BUFB Data: 0xfffd4a727a6f456b

    Compare AND : ok
    Sequential Increment: ok
    Solid Bits : setting 4 of 64^C

    Single User:
    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 10.5.8 (9L31a) running in single user mode
    Memory Page Size: 4096
    System has 1 PPC processors(s) with Altivec
    Requested memory: 2248MB (2357305344 bytes)
    Available memory: 2248MB (2357305344 bytes)
    NOTE: Memory request is too large, reducing to acceptable value...
    Allocated memory: 2185MB (2291300736 bytes) at local address 0x0000000001000000
    Attempting memory lock... locked successfully
    Partitioning memory into 2 comparison buffers...
    Buffer A: 1092MB (1145650368 bytes) starts at local address 0x0000000001000000
    Buffer B: 1092MB (1145650368 bytes) starts at local address 0x0000000045493cc0

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

    Test sequence 1 of 1:

    Running tests on full 2185MB region...
    Stuck Address : ok
    Linear PRN : ok
    Running comparison tests using 1092MB 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 : setting 7 of 64^C

    (I realize I didn't run the entire test in both of these logs, but the results were the same when running the entire test several times)

    The only difference I notice is that in single user mode it is never able to lock onto the entire ram, and it is always able to do so in multiuser mode. What's going on here? Are the multiuser results false positives?
     
  2. alent1234 macrumors 603

    Joined:
    Jun 19, 2009
    #2
    does the computer work?

    i've used and built my own since the 1990's and never used most of these things. one time when i didn't know any better i bought a memory management program for windows 95 which was a waste of money.

    if the computer works leave it alone. no reason to be OCD about it
     
  3. Presence thread starter macrumors newbie

    Joined:
    Jan 21, 2011
    #3
    Yes the computer recognizes the RAM and runs. That's not always a good indication of whether a RAM stick is good or not. This is more of a preventative measure than anything to make sure I don't run into problems later on.

    Is this RAM stick good, or should I RMA the RAM I just bought?
     

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