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False RAM errors because of a user mistake?

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  • False RAM errors because of a user mistake?

    Hi!

    I created a bootable USB with the latest free version of Memtest86 and tested RAM on a friend's computer that was giving him problems, there was no errors displayed, until I plugged in another USB stick (in another USB port) during the test. This was during pass 1 - test 7 (inversions), then a ton of errors appared and Memtest86 reported that there are too many errors and ended the tests with big red FAILED message.

    Then I shutdown the PC, unplugged the other USB stick and booted into Memtest86 again, did 4 passes and there were no errors at all.

    So, my question - was I me that created the errors because I plugged another USB stick into the PC during the test? Or is the RAM bad and that was a coincidence? I didn't have time to retry the scenario, I assumed the RAM was OK The PC is in another city so I can't try again anytime soon. So does anyone know?

    Thanks!

  • #2
    Test 6 & 7 are the tests that most commonly produce errors.

    So I suspect it was just a timing coincidence.

    I guess it isn't impossible that a USB flash drive could provoke RAM errors (e.g. power spike or EMI), but it isn't a common thing.
    There is also a small chance it is some kind of UEFI BIOS bug. Maybe the BIOS ran some background task when the USB drive was inserted and corrupted some RAM.

    It isn't really a user mistake. You should be able to insert & remove other USB devices during the test without bad things happening. (You can't remove the USB boot drive however).

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    • #3
      Thank you very much for the reply, it clears a lot. I assume it has to be an UEFI BIOS bug, because there was no errors whatsoever during that 1st incomplete pass and the errors began when I plugged in the 2nd USB. And after repeating the testing, this time for 4 full passes, there were no errors at all. If the PC will act up again, I will re-test the RAM, way more thorougly this time. Hope I won't have to.

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      • #4
        Just for the record in case the problem is reported again, what motherboard was this with? And the BIOS version if you know it.

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        • #5
          ASRock H81M, BIOS v2.00
          https://www.asrock.com/MB/Intel/H81M/index.asp#BIOS

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