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Errors at first, then no errors for 29 passes

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  • Errors at first, then no errors for 29 passes

    I ran MemTest86 v7.4 on one 8 GB stick DDR3.

    First round gave 1 error in test 7 on the 11th pass. Second round gave 2 errors in test 6 on the 2nd pass. Third round gave no errors after 29 passes (only test with HTML saved).

    Afterwards, I also ran a windows based RAM test (HCI) overnight which gave no errors after 1500% coverage.


    Can anyone provide an opinion on these results? Is the RAM stick bad?


    HTML file: Summary

    Report Date 2018-01-30 18:08:35
    Generated by MemTest86 V7.4 Free (64-bit)
    Result PASS
    System Information

    EFI Specifications 2.31
    System
    Manufacturer Hewlett-Packard
    Product Name HP Compaq Pro 6300 SFF
    Version
    Serial Number removed
    BIOS
    Vendor Hewlett-Packard
    Version K01 v02.90
    Release Date 07/16/2013
    Baseboard
    Manufacturer Hewlett-Packard
    Product Name 339A
    Version
    Serial Number removed
    CPU Type Intel Core i5-3470 @ 3.20GHz
    CPU Clock 3193 MHz [Turbo: 3591.9 MHz]
    # Logical Processors 4
    L1 Cache 4 x 64K (92607 MB/s)
    L2 Cache 4 x 256K (48882 MB/s)
    L3 Cache 6144K (28726 MB/s)
    Memory 8071M (9816 MB/s)
    DIMM Slot #0 8GB DDR3 PC3-12800
    Patriot Memory (PDP Systems) / PSD38G16002
    11-11-11-28 / 1600 MHz / 1.5V
    Result summary

    Test Start Time 2018-01-29 18:48:48
    Elapsed Time 23:19:40
    Memory Range Tested 0x0 - 21EE00000 (8686MB)
    CPU Selection Mode Parallel (All CPUs)
    ECC Polling Enabled
    # Tests Passed 353/353 (100%)
    Test # Tests Passed Errors
    Test 0 [Address test, walking ones, 1 CPU] 30/30 (100%) 0
    Test 1 [Address test, own address, 1 CPU] 30/30 (100%) 0
    Test 2 [Address test, own address] 30/30 (100%) 0
    Test 3 [Moving inversions, ones & zeroes] 30/30 (100%) 0
    Test 4 [Moving inversions, 8-bit pattern] 30/30 (100%) 0
    Test 5 [Moving inversions, random pattern] 29/29 (100%) 0
    Test 6 [Block move, 64-byte blocks] 29/29 (100%) 0
    Test 7 [Moving inversions, 32-bit pattern] 29/29 (100%) 0
    Test 8 [Random number sequence] 29/29 (100%) 0
    Test 9 [Modulo 20, ones & zeros] 29/29 (100%) 0
    Test 10 [Bit fade test, 2 patterns, 1 CPU] 29/29 (100%) 0
    Test 13 [Hammer test] 29/29 (100%) 0

  • #2
    Yes, very likely RAM is intermittently bad.

    Comment


    • #3
      Changed the motherboard, CPU, PSU and also installed other RAM sticks [4+4+8+8]. The 8 GB DDR3 ram stick I tested in the original post is paired in the same channel with the other RAM stick that was originally included in the 16 GB kit (2x8GB). The two 4 GB sticks are from another manufacturer. Previously, I've tested these other sticks (the other 8 GB stick and the two 4 GB sticks) in memtest in this changed motherboard and they all passed (11 passes).

      First I ran HCI memtest to 600% coverage with no errors. Then I ran two other tests with no error but only extremely briefly (1 hr AIDA64 memory/cache stress and 6 hours prime95 custom config FFT size, no FFT in place, & 95% RAM).

      Lastly, I ran memtest86 7.4 with no error on 10 passes (below). There were row hammer notes, though.

      Summary

      Report Date 2018-02-02 18:43:50
      Generated by MemTest86 V7.4 Free (64-bit)
      Result PASS
      System Information

      EFI Specifications 2.31
      System
      Manufacturer ASUS
      Product Name All Series
      Version System Version
      Serial Number System Serial Number
      BIOS
      Vendor American Megatrends Inc.
      Version 2201
      Release Date 06/25/2015
      Baseboard
      Manufacturer ASUSTeK COMPUTER INC.
      Product Name B85M-G R2.0
      Version Rev X.0x
      Serial Number removed
      CPU Type Intel Core i7-4770 @ 3.40GHz
      CPU Clock 3392 MHz [Turbo: 3691.4 MHz]
      # Logical Processors 8 (4 enabled for testing)
      L1 Cache 4 x 64K (175221 MB/s)
      L2 Cache 4 x 256K (52675 MB/s)
      L3 Cache 8192K (39189 MB/s)
      Memory 24503M (16237 MB/s)
      DIMM Slot #0 4GB DDR3 XMP PC3-12800
      Team Group Inc. / Vulcan-1600
      9-9-9-24 / 1600 MHz / 1.500V
      DIMM Slot #1 4GB DDR3 XMP PC3-12800
      Team Group Inc. / Vulcan-1600
      9-9-9-24 / 1600 MHz / 1.500V
      DIMM Slot #2 8GB DDR3 PC3-12800
      Patriot Memory (PDP Systems) / PSD38G16002
      11-11-11-28 / 1600 MHz / 1.5V
      DIMM Slot #3 8GB DDR3 PC3-12800
      Patriot Memory (PDP Systems) / PSD38G16002
      11-11-11-28 / 1600 MHz / 1.5V
      Result summary

      Test Start Time 2018-02-01 22:30:48
      Elapsed Time 20:12:57
      Memory Range Tested 0x0 - 61E000000 (25056MB)
      CPU Selection Mode Parallel (All CPUs)
      ECC Polling Enabled
      # Tests Passed 130/130 (100%)
      Test # Tests Passed Errors
      Test 0 [Address test, walking ones, 1 CPU] 11/11 (100%) 0
      Test 1 [Address test, own address, 1 CPU] 11/11 (100%) 0
      Test 2 [Address test, own address] 11/11 (100%) 0
      Test 3 [Moving inversions, ones & zeroes] 11/11 (100%) 0
      Test 4 [Moving inversions, 8-bit pattern] 11/11 (100%) 0
      Test 5 [Moving inversions, random pattern] 11/11 (100%) 0
      Test 6 [Block move, 64-byte blocks] 11/11 (100%) 0
      Test 7 [Moving inversions, 32-bit pattern] 11/11 (100%) 0
      Test 8 [Random number sequence] 11/11 (100%) 0
      Test 9 [Modulo 20, ones & zeros] 11/11 (100%) 0
      Test 10 [Bit fade test, 2 patterns, 1 CPU] 10/10 (100%) 0
      Test 13 [Hammer test] 10/10 (100%) 0
      Test 13 [Hammer test] Warning
      Note: Your RAM may be vulnerable to high frequency row hammer bit flips. However the conditions needed to induce these errors occur only very rarely in normal PC usage, and so this should not be of concern to most users.


      It looks okay for now, but I will consider replacing the 8GB stick at a later time.

      Comment

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