How to Test PC RAM with MemTest86

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Find errors with your PC memory with this guide

Reviewed by Stan Kats

Last Updated: April 14, 2025

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Using MemTest86+ with a CD/DVD

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Using MemTest86+ with a USB

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Video

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Tips

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Warnings

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Unreliable RAM, or random-access memory, can lead to a variety of problems with your computer, including corrupted data, crashes, and strange, unexplained behaviour. Having flawed or damaged RAM can be one of the most frustrating computer problems because symptoms are very often random and difficult to identify. This wikiHow article teaches you how to test your PC's RAM with MemTest86.

Using MemTest 86 for Memory Issues

To test your PC RAM with MemTest86, connect a blank USB to your PC. Download MemTest86+ Auto Installer onto the USB. Restart your computer and enter the BIOS. Set the USB as the first boot priority. Let MemTest86 run for 7-8 passes to find errors.

Method 1

Method 1 of 2:

Using MemTest86+ with a CD/DVD

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Memtest86+ is an open source program so it is legal to get. The official download site is http://memtest.org here. However, make sure not to confuse it with the original MemTest, which has now become outdated.
Inside you will find a folder entitled mt420.iso. Drag this file to your desktop.

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Remember to insert a blank CD into your computer in order to download the program.
Then choose Windows Disk Burner. The Windows Disk Image Burner will now open. Select Burn.
MemTest86+ will automatically run once the computer is restarted if the CD option is first in the boot priority. You can set this by pressing F8 on most computers
You should let MemTest86+ run for 7 to 8 passes in order to ensure accuracy. After it has done so in slot #1, switch to slot #2 and repeat. Do this until you have gone through every RAM slot.
Errors will be highlighted in red. If there are no problems, then your computer's RAM may very well be fine. If the test does identify errors in your RAM, then you may need to take your PC in for repairs.

Method 2

Method 2 of 2:

Using MemTest86+ with a USB

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Make sure that the USB that you use is blank prior to use, otherwise, the other files will be deleted.
This may take a few seconds to complete and a command window will briefly appear. This is part of the process so ignore it until you are prompted to click Next.
After you have done this, restart your computer. Make sure to leave the USB plugged into your computer. MemTest86 will automatically run once your computer is restarted if the USB option is the first boot priority. You can set this by pressing F8 on most computers.
You should let MemTest86+ run for 7 to 8 passes in order to ensure accuracy. After it has done so in slot #1, switch to slot #2 and repeat. Do this until you have gone through every RAM slot.
Errors will be highlighted in red. If there are no problems, then your computer's RAM may very well be fine. If the test does identify errors in your RAM, then you may need to take your PC in for repairs.

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Tips

If you can't start the computer, try using another computer if available and compatible with RAM type. However if the computer won't boot due to PSU failure have a computer shop test the RAM because if you try to do it on another computer, the RAM may damage the computer.

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Warnings

Never remove the RAM while the test is running. You might get electrocuted or cause corruption on the RAM that will damage it.

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If you remove the RAM to replace it if you know about computers then be careful taking it out and replacing it. The RAM is fragile!

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