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How To Run Memory Diagnostics

If you have multiple sticks of RAM (e.g., two 8GB sticks making 16GB) and you find errors, you need to find the culprit.

The Slot Swap Technique:

  • Repeat for every stick.

    • Pro Tip: Sometimes the stick is fine, but the slot on the motherboard is dirty or broken. If every stick fails in Slot 1 but passes in Slot 2, throw away the motherboard, not the RAM.

    Random Access Memory (RAM) is your computer’s short-term memory. It holds the data your processor needs right now—from your open browser tabs to your active game session. When RAM starts to fail, your system becomes unpredictable. You might see the dreaded Blue Screen of Death (BSOD), sudden reboots, application crashes, or corrupted files. how to run memory diagnostics

    Before you replace your motherboard or reinstall your operating system, you need to answer one critical question: Is my RAM faulty?

    This guide will walk you through every method of running memory diagnostics, from built-in Windows tools to advanced Linux utilities. By the end, you will know exactly how to test, interpret, and fix memory-related problems.

    Your RAM is likely fine. Your crashes are probably due to: If you have multiple sticks of RAM (e

    | Mistake | Why It’s Wrong | | :--- | :--- | | Running diagnostics while overclocked | Overclocking (XMP/DOCP) can cause false errors. Set BIOS to defaults first. | | Only running one quick pass | Intermittent errors may not appear for hours. Run at least 4 passes or overnight. | | Assuming Windows is the problem | Many users reinstall Windows for crash issues that are actually bad RAM. Test first. | | Mixing unmatched RAM kits | Even same brand/model from different batches can cause errors. Always use identical kits. |

    If you really want to know if your RAM is stable, you don't use Windows' tool. You use MemTest86. It is the gold standard—the MRI scan of memory diagnostics.

    Why use it? Windows runs on top of your RAM. If your RAM is slightly bad, Windows might misreport the error. MemTest86 runs from a USB stick before Windows loads, giving it pure, unadulterated access to the hardware. Repeat for every stick

    How to do it:

    The Aesthetic: It looks like retro hacker software from the 90s. It’s satisfying to watch. If you see RED lines (errors), your stick is toast.

    MemTest86 gives you a detailed "Test #" error. For example:

  • Select that option. The test will immediately begin.

    • If you are running Windows 10 or Windows 11, you already have a perfectly capable memory testing tool built directly into the operating system. It’s not the most thorough tool on this list, but it is the most convenient for catching gross memory errors.