PassMark MemTest86 is a stand alone memory testing software program originally developed for x86 computers. It was re-written to work on x64 devices (with the native 64-bit support) and on new UEFI-based machines. Follow the instructions below for running MemTest86 from either a USB stick (this procedure is recommended by PassMark) or a CD/DVD (this procedure is not recommended by PassMark) You don't need both! Download MemTest86 and burn it onto a USB stick This procedure is recommended by PassMark. Simple steps Get a 256MB USB stick, or larger. Go to PassMark MemTest86 download webpage (click), click Image for creating bootable USB stick, save the file and extract/unzip it. Plug in your USB stick. Launch imageUSB.exe and follow the instructions. Detailed steps Get a 256MB USB stick, or larger. A USB stick is also known as "flash drive", "pen drive", "thumb drive", "jump drive", "memory stick" and so forth. Note: The files/folders present in it will be DELETED. If you need them, copy them to another safe place (i.e., create a backup). Go to PassMark MemTest86 download webpage (click). Under Windows Downloads, click Image for creating bootable USB stick and save the file in your PC. (Optional) Scan the new downloaded file with your default antivirus. You can scan the file with other tools (as examples: MalwareBytes 3 free, SuperAntiSpyware free, virustotal.com, metadefender.com, jotti.org, virscan.org). Extract/unzip it to your preferred place (desktop, new folder, existing folder... It's your choice). As an example, I have created a folder named "passmark memtest86". Windows should be able to unzip the folder on its own (after some actions/clicks made by you). If this won't be the case, you can download/install 7-zip, open source and free, latest stable version from 7-zip.org or sourceforge.net. Plug in your USB stick. Launch the included application: imageUSB.exe. Click Yes in the user account window that should appear, if you didn't disable UAC settings (Control Panel\User Accounts\User Accounts). Step 1: Select your USB stick from the list. Step 2: (if it is not already selected) Select 'Write image to USB stick'. Step 3: (if it is not already selected) Select the included image file: memtest-usb.iso. Step 4: Click 'Write'. Click Yes to confirm the operation and Yes to the final warning (it says it will delete all data in the USB stick). After it completes, the USB stick should be ready to be used. It takes about 30 seconds on my system. Download MemTest86 and burn it onto a CD/DVD This procedure is NOT recommended by PassMark. Simple steps Get a rewritable CD/DVD. Go to PassMark MemTest86 download webpage (click), click Image for creating bootable CD (ISO format), save the file and extract/unzip it. Put the CD in your CD/DVD drive. Burn the MemTest86 ISO image in your CD/DVD with your preferred burning software. Detailed steps Get a rewritable CD/DVD. Note: The files/folders present in it will be DELETED. If you need them, copy them to another safe place (i.e., create a backup). Go to PassMark MemTest86 download webpage (click). Under Windows Downloads, click Image for creating bootable CD (ISO format) and save the file in your PC. (Optional) Scan the new downloaded file with your default antivirus. You can scan the file with other tools (as examples: MalwareBytes 3 free, SuperAntiSpyware free, virustotal.com, metadefender.com, jotti.org, virscan.org). Extract/unzip it to your preferred place (desktop, new folder, existing folder... It's your choice). As an example, I have created a folder named "passmark memtest86". Windows should be able to unzip the folder on its own (after some actions/clicks made by you). If this won't be the case, you can download/install 7-zip, open source and free, latest stable version from 7-zip.org or sourceforge.net. Put the CD/DVD in your CD/DVD drive. Quotation from readme.txt of MemTest86:Use the CD burning software available on your system to create a CD-ROM using the ISO image. Be sure that you create a CD image from the ISO file rather than placing a copy of the ISO file onto a data CD. Look for “Burn Image from File” or similar option under the File menu of your CD burning software. At the time of this post, the iso image is named Memtest86-7.4.iso. This is the most current version, but it will change for sure in the future. Take the number 7.4 as an example. You will be using always the latest and most updated version. Example with cdburnerxp free: Open cdburnerxp Double click Burn ISO image (or one click to select, click ok to open the "burn iso image" interface) Select ISO image to burn: type (or copy/paste) the complete path to the iso image Memtest86-7.4.iso or click the browse button to find and locate it. Target device: your cd/dvd drive should be already selected, change the speed. 1x for best results. Burn method: DAO16 (or DAO96) Click burn disc Example with imgburn free: Open imgburn. Click write image file to disc. Source: click the browse button to find and locate the iso image Memtest86-7.4.iso. Write speed: 1x for best results. Click the write picture (cd on a paper, right arrow, cd image). Example with ashampoo burning studio 2017 free: Open ashampoo burning studio 2017. Disc image, burn image. Disc image path: type (or copy/paste) the complete path to the iso image Memtest86-7.4.iso or click the browse button to find and locate it. Click next. It chooses the write speed on its own and it isn't editable (at least when I tried it on my system). Click write cd (or write dvd). Leave the USB stick, or CD/DVD, inserted. You should now "tell" your machine to boot from the media you created right now, through its boot menu. To access the boot menu, reboot your computer. During the initial stages of the boot process, press the applicable key as prompted. As an example, F11 is usually the key for the boot menu on ASROCK motherboards. If you don't know the key for your system, check your motherboard manual or this tutorial: Get access to BIOS settings & Boot Menu: F-keys/Hotkeys by System Manufacturer (OEM) (click). Select the USB stick, or the CD/DVD disc, with MemTest86 on it. Wait some minutes (it needs almost 80 seconds on my machine) and MemTest86 will be available on your screen. If the program won't start, and you'll be redirected to the boot menu (or your machine boots windows), it could be necessary to disable the Fast boot feature (in your BIOS settings). To enter the BIOS settings, during the initial stages of the boot process, press the applicable key as prompted. It is usually Del or F2. If you don't know the key for your system, check your motherboard manual or this tutorial: Get access to BIOS settings & Boot Menu: F-keys/Hotkeys by System Manufacturer (OEM) (click). If you still can't launch the program, it could be necessary to enable the CSM (Compatibility Support Module) in your BIOS settings. This is also known as Launch CSM or boot: legacy (instead of boot: uefi). If you still can't launch the program, try to disable also the Secure boot feature. When finally MemTest86 will be available on your screen, it will automatically start the test. You can use the letters between parenthesis to access its menus and the arrows on your keyboard to navigate through menu options. Your mouse (and the mouse pointer on the screen) could also be available (mine was, but it was also slow). Then press S (on your keyboard) to start the test, or click start test with the mouse pointer. Wait until it finishes or until an error appears. This test could take few hours. At the end of the test, you can save an HTML report. You'll find it in the USB stick, in :\EFI\BOOT. Example: H:\EFI\BOOT\MemTest86-Report-20171203-195935.html. Added by Philc43: when errors are found with a single stick, it is also worth testing that stick in other slots to check that the errors are not due to a MB slot problem. Check the lines after the warning in this tutorial for more details (click) (and obviously, read also the warning). Screenshots Memtest86 main menu Test selection Example of a test in progress Test result Results of each test Report
