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  • #1

    Random BSOD

    Hello everyone,

    After getting lots of random BSOD in the last days I decided to test my memory with MemTest86 and I got the results :

    Generated by MemTest86 V8.3 Free (64-bit)
    Result FAIL
    System Information
    EFI Specifications 2.60
    System
    Manufacturer Gigabyte Technology Co., Ltd.
    Product Name Z370 AORUS Gaming 5
    Version Default string
    Serial Number Default string
    BIOS
    Vendor American Megatrends Inc.
    Version F5e
    Release Date 01/10/2018
    Baseboard
    Manufacturer Gigabyte Technology Co., Ltd.
    Product Name Z370 AORUS Gaming 5-CF
    Version x.x
    Serial Number Default string
    CPU Type Intel Core i7-8700K @ 3.70GHz
    CPU Clock 3734 MHz [Turbo: 4944.9 MHz]
    # Logical Processors 12 (6 enabled for testing)
    L1 Cache 4 x 64K (241751 MB/s)
    L2 Cache 4 x 256K (134272 MB/s)
    L3 Cache 12288K (49785 MB/s)
    Memory 32726M (28659 MB/s)
    DIMM Slot #0 8GB DDR4 XMP PC4-23900
    Corsair / CMK16GX4M2B3000C15
    15-17-17-35 / 2998 MHz / 1.350V
    DIMM Slot #1 8GB DDR4 XMP PC4-23900
    Corsair / CMK16GX4M2B3000C15
    15-17-17-35 / 2998 MHz / 1.350V
    DIMM Slot #2 8GB DDR4 XMP PC4-23900
    Corsair / CMK16GX4M2B3000C15
    15-17-17-35 / 2998 MHz / 1.350V
    DIMM Slot #3 8GB DDR4 XMP PC4-23900
    Corsair / CMK16GX4M2B3000C15
    15-17-17-35 / 2998 MHz / 1.350V
    Result summary
    Test Start Time 2020-05-07 20:21:31
    Elapsed Time 0:02:12
    Memory Range Tested 0x0 - 83F000000 (33776MB)
    CPU Selection Mode Parallel (All CPUs)
    ECC Polling Enabled
    # Tests Passed 1/4 (25%)
    Lowest Error Address 0x7FEA10180 (32746MB)
    Highest Error Address 0x7FEA17E5C (32746MB)
    Bits in Error Mask 0000080000000800
    Bits in Error 2
    Max Contiguous Errors 2
    Test # Tests Passed Errors
    Test 0 [Address test, walking ones, 1 CPU] 1/1 (100%) 0
    Test 1 [Address test, own address, 1 CPU] 0/1 (0%) 278
    Test 2 [Address test, own address] 0/1 (0%) 270
    Test 3 [Moving inversions, ones & zeroes] 0/1 (0%) 2035
    Test 4 [Moving inversions, 8-bit pattern] 0/0 (0%) 7652
    Test 5 [Moving inversions, random pattern] 0/0 (0%) 0
    Test 6 [Block move, 64-byte blocks] 0/0 (0%) 0
    Test 7 [Moving inversions, 32-bit pattern] 0/0 (0%) 0
    Test 8 [Random number sequence] 0/0 (0%) 0
    Test 9 [Modulo 20, ones & zeros] 0/0 (0%) 0
    Test 10 [Bit fade test, 2 patterns, 1 CPU] 0/0 (0%) 0
    Test 13 [Hammer test] 0/0 (0%) 0
    Last 10 Errors
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11BDC, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11BD4, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11BCC, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11B94, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11B8C, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11B84, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA118CC, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA118C4, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA1189C, Expected: 80808080, Actual: 80808880
    2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA1188C, Expected: 80808080, Actual: 80808880

    I have 4 x 8GB Corsair DDR4 and I thought one of them might be broken and I tested them one by one in DIMM Slot 1 and I had 0 error.
    Then I tested each memory in all DIMM slots (1,2,3,4) and again I had 0 errors.
    Then I put back all 4 memory and test it again and I had the same errors as above.
    Then I tested 3 memories at a time in the following DIMM slots (as numbered on the motherboard) :
    2 - 3 - 4 = No errors
    1 - 2 - 4 = No errors
    1 - 3 - 4 = No errors
    1 - 2 - 3 = Errors as above.

    Can you help me here with an advice? What I should do next? It's the motherboard broken?

    Thanks!
    Tags: None
  • #2
    Sometimes faults are only seen when the RAM is in dual channel mode,
    So you might be better off testing them in pairs (not individually, or by 3s) using the slots required to get the RAM into dual channel mode.

    Comment

    • #3
      Thanks for the reply.

      After reading the manual I found this : the four memory sockets are divided into two channels and each channel has two memory sockets as following:
      Channel A: DDR4_2, DDR4_4
      Channel B: DDR4_1, DDR4_3

      I tested both channels without any error.

      But I made another few tests and I think I found a possible damaged memory which gives errors only under certain conditions.

      Case 1 - errors
      Channel A: Bad Memory, good memory
      Channel B: good memory, good memory

      From here I made every combination to isolate the Bad memory.

      Case 2 - errors
      Channel A: Bad Memory
      Channel B: good memory, good memory

      Case 3 - errors
      Channel A: good memory, good memory
      Channel B: Bad Memory

      What it's strange it's this :

      Case 4 - No errors
      Channel A: Bad Memory, good memory
      Channel B: good memory

      Case 5 - No errors
      Channel A: good memory
      Channel B: Bad Memory, good memory

      Case 6 - No errors - I tested here the bad memory with each good memory and I didn't got any error.
      Channel A: Bad Memory, good memory
      Channel B:

      Case 7 - No errors
      Channel A:
      Channel B: Bad Memory, good memory

      Have you seen anything like this before?

      Comment

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