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description=Memtest86+ is an advanced, free, open-source, stand-alone memory tester for 32- and 64-bits architecture computers. Compatible with BIOS & UEFI.;
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Text of the page (random words):
memtest86 the open source memory testing tool dev nightly archives memtest86 is a free open source stand alone memory tester for ia 32 x86 64 and loongarch64 systems it provides a more thorough memory check than that provided by bios memory tests on x86 systems memtest86 can be loaded and run either directly by a pc bios legacy or uefi or via an intermediate bootloader that supports the linux boot protocol it should work on any pentium class or later 32 bit x86 cpu any 64 bit x86 cpu and supported loongson la64 systems licensing general public license v2 memtest86 is a unified free open source memory testing tool released under gnu gpl v2 0 the new v6 code base originally called pcmemtest was provided by martin whitaker based on memtest86 v5 developed by sam demeulemeester both are now working on memtest86 memtest86 is not an edition of memtest86 which since 2013 has been closed source freemium software owned by passmark software pty ltd screenshots ddr5 7200 qualification 224 threads 3tb ram server retro rambus rdram on pentium 4 why test your ram troubleshoot pc instabilities memory errors are one of the most common causes of crashes freezes and instabilities if you encounter such issues with your computer testing your ram thoroughly is probably the first thing to do memtest86 uses various algorithms to reliably detect failures it will let you know if your ram is faulty or not ensure initial stability before using your brand new pc putting your new server into production or after having overclocked your cpu or ram it s often wise to make sure there are no memory issues troubleshooting issues later can be annoying costly and time consuming frequently asked questions faq this faq covers the main issues with memtest86 please also read the full readme if you don t find an appropriate answer installation on removable media how to create a bootable memtest86 usb drive using windows plug a standard fat32 formatted usb drive download and launch the windows usb installer and follow the quick steps reboot your computer and select the usb drive in your boot menu how to create a bootable memtest86 usb drive using linux the iso image must be written directly dumped to the raw device either by using the dd command or by using a utility that provides the same functionality like balenaetcher how to create a bootable memtest86 usb drive using macos we recommand balenaetcher to burn the image to a usb flash drive under macos ps using the restore function in apple s disk utility does not work which media are supported memtest86 can be run from a usb flash drive fat32 formatted cdrom drive by burning the iso to a blank disk or network boot pxe if you need a floppy image use the make iso command to generate a floppy img file booting issues i can t boot because of a secure boot violation the memtest86 binary is not signed by microsoft so you need to temporarily disable secure boot in your bios options we re working on a better solution memtest86 does not launch to boot from a usb flash drive instead of your hard drive you must select it using the boot menu the boot menu is usually available by pressing f8 f12 or esc at early startup please check your pc motherboard manual can i launch memtet86 using pxe yes just use memtest bin for bios pxe or memtest efi for uefi pxe as payload for ipxe or pxelinux don t forget to disable secure boot my usb keyboard does not work memtest86 usb drivers are work in progress not all usb devices are supported yet and there may be problems on some hardware please submit a bug report with detailed information troubleshooting ram errors i got errors what s next once a memory error has been detected determining the failing module is not a clear cut procedure if your computer is overclocked you should try again at default settings first then if you have more than one memory module try removing them one at a time to find the faulty one you can also rotate them for more informations look here i only have some bits wrong any solution yes both linux and windows offer a way to exclude small bad memory areas an additional memtest86 feature is planned to easily generate the required patterns for windows various when does it stop it doesn t memtest86 is an endless loop after a successful pass all your memory has been tested successfully you can wait longer for even greater confidence or just press esc to stop which tests are executed by memtest86 for a more detailed explanation about memtest86 s test algorithms and induvial test descriptions please check this section of the readme page how to use the com serial output on windows edit the file syslinux cfg at the root of the usb drive and add append ttys0 after kernel mt86plus on linux pass the parameter ttys0 using grub iso alternatively compile your own version with the switch enable_tty true in config c default settings are 8n1 115200 bps why is memtest86 testing more memory than i have it doesn t the memory on a modern computer is not necessarily mapped in a linear way e g 16gb of ram can be virtually mapped from 0 15gb and 16 17gb with a hole between 15gb and 16gb download latest version memtest86 v8 10 released 2026 05 16 checksum md5 sha256 sha512 windows usb installer 32 64 bits latest version linux iso 32 bits latest version linux iso w grub 64 bits latest version linux iso 64 bits latest version binary files for pxe and chainloading source code zip used to build these binaries v8 10 changelog add support for x2apic better support for intel panther lake better bandwidth measurement fix timings on lpddr5 fix ami bios boot issues fix grub boot issues fix secureboot code for shim la64 specific improvements bug fixes nightly builds pre release beta versions nightly builds are generated automatically each night with the latest code changes and updates they are fully untested and may contain issues nightly builds memtest86 timeline evolution of the gpl version memtest86 v6 newer m whitaker s demeulemeester 2022 pcmemtest martin whitaker 2020 2022 memtest86 v1 v5 sam demeulemeester 2004 2020 memtest86 v3 eric biederman 2004 memtest 86 chris brady 1994 2002 bug report found a bug please file a bug report on our official github page please give us as much information as possible about your hardware and the way to reproduce the issue also please check that your bug hasn t already been submitted submit issue donation last donators list donations are actually disabled thanks to paypal until we set up another form of support feel free to donate hardware directly if you require support for memtest86 michael scalera donated on 2022 12 03 stephen liu donated on 2022 12 02 kim skråmo donated on 2022 11 18 gunther mayer donated on 2022 11 16 glitch works llc donated on 2022 11 04 link william viergever donated on 2022 11 01