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Memtest86 v5.0

A Full Review of Memtest86, a Free RAM Testing Software Program

User Rating 3.5 Star Rating (16 Reviews)


Screenshot of Memtest86 v5.0

Memtest86 v5.0

Memtest86 is simply the best free memory test program available today. Memtest86 is very easy to use and equally thorough. It's also one of the few diagnostic tools of any kind that's valuable to both novices and experts alike.

A short memory test is often completed by the BIOS during the POST but the test is not at all thorough. A complete memory test by an excellent program like Memtest86 is necessary to truly determine if your computer's RAM is working properly.

If you test your memory with only one memory testing program, make Memtest86 that program without a doubt!

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Note: This review is of Memtest86 version 5.0, released on December 3, 2013. Please let me know if there's a newer version I need to review.

Memtest86 Pros & Cons

If it's not already clear, there's a lot to like about this memory tester:


  • Industry standard memory test - same one used by experts
  • Completely free diagnostic tool
  • Easy enough for anyone to use and interpret results from
  • Product is fully supported meaning updates and fixes are planned
  • Very small download


  • Advanced features could intimidate novice users

More on Memtest86

  • Memtest86 performs multiple tests to locate the most obscure memory problems.
  • Several advanced options are available but aren't necessary for a standard memory test.
  • Memtest86 is continually updated to support newer memory and computer types.
  • Test set will automatically repeat as often as you want to provide confirmation that the memory passed or failed the tests.
  • Works with Windows 8, Windows 7, Windows Vista, Windows XP, Linux and any other PC operating system.
  • Memtest86 can test memory without any operating system installed since it's a standalone diagnostics tool.
  • Supports up to 64GB of RAM.
  • Memtest86 works with all memory types and supports both 32-bit and 64-bit systems.

How To Use Memtest86

Get started by visiting the Memtest86 website. Once there, download the zipped ISO image via the Image for creating bootable CD link. It's a small file so it shouldn't take more than a minute on any connection.

Once downloaded, extract the ISO file and burn it to a CD. Burning an ISO file is a bit different than burning other files like documents or music. If you need help, see How To Burn an ISO Image File to a Disc.

Next, boot from the disc. Memtest86 will start almost immediately. If Memtest86 doesn't start (for example, your operating system loads as normal or you see an error), then see these tips on booting from discs.

On the Memtest86 menu, click on Config. Here you'll see lots of information about your CPU and memory. Click on Start Test to begin the memory test.

You'll see two progress bars and several changing letters and numbers in the top-right part of the Memtest86 screen. Don't worry about all the technical information - you don't need to know exactly what it all means.

The Test bar indicates how complete the current memory test is. The Pass bar indicates how complete the entire set of tests is. When all 10 memory tests are complete then 1 pass has completed.

Once one pass has completed without error, the "Pass complete, no errors, press Esc to exit" message will appear. At this point you can press Esc to stop Memtest86 and reboot your PC. By default, Memtest86 will make 4 passes unless you force it to stop.

I recommend replacing the RAM if Memtest86 finds any errors. Even if you aren't seeing issues with your computer right now, you likely will in the future.

My Thoughts on Memtest86

Memtest86 is absolutely the best of the free memory testing programs. I've used several expensive memory test tools and none compare to Memtest86.

If you're seeing random lock-ups, strange errors, issues during a Windows installation, or you suspect a hardware problem then I highly recommend you test your memory with Memtest86!

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