I bought a used PC that is quite old and decided to test the RAM with memtest86 (ran for about 3.5 hrs) using a live USB but it seems that only one module (the first one in slot 0 which is the slower one) is tested. Since the test never finishes, how do I test the second module? Do I have to physically remove the first before testing the second module?


  • What it's really telling you is that you can't mix and match RAM sticks with different speeds.
    – heynnema
    Jun 1, 2017 at 22:11

1 Answer 1


Afaik Memtest86 has no feature to restrict the test to a particular memory module. You need to remove all other modules to test a single specific module.

  • There's no "quick and dirty" way to tell if you're RAM is alright?
    – H3R3T1K
    Jun 1, 2017 at 21:47
  • @H3R3T1K: "Quick and dirty" kind of defeats the purpose of an integrity check. Jun 1, 2017 at 21:49
  • True. I just tested the HDD in the same PC and it's so much easier.
    – H3R3T1K
    Jun 1, 2017 at 21:57

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