page_title: Memtest86
section_title: Description
hierarchical_section_title: Memtest86 / Description
caption_attribution_description: English: A screenshot of Memtest86+ showing Memtest86+ 5.01 in action. After 11 hours of testing, there are 15806208 errors, 16G of RAM, 4 pass. 2017. It is fun but this computer can work more or less stable with such memory. Русский: 15 млн ошибок в программе Memtest86+, тестирующей память компьютера. 2017 год.
context_page_description: MemTest86 and Memtest86+ are memory test software programs designed to test and stress test an x86 architecture computer's random access memory for errors, by writing test patterns to most memory addresses, reading back the data, and comparing for errors. Each tries to verify that the RAM will accept and correctly retain arbitrary patterns of data written to it, that there are no errors where different bits of memory interact, and that there are no conflicts between memory addresses.
context_section_description: There are two development streams of Memtest86. The original is simply known as MemTest86. The other, known as Memtest86+, is a development fork of the original MemTest86. Their on-screen appearance and functionality were almost identical up until the v4 releases. However, version 5 of MemTest86 added a mouse-driven graphical user interface (GUI) and UEFI support.
  These programs work with nearly all PC-compatible computers from 80386- and 80486-based systems to the latest systems with 64-bit processors. Each new release adds support for newer processors and chipsets.
  MemTest86(+) is designed to run as a stand-alone, self-contained program from a bootable USB flash drive, CD-ROM, floppy disk, or from a suitable boot manager without an operating system present. This is because the program must directly control the hardware being tested and leave as much of the RAM space as possible for examination.
  MemTest86(+)'s testing is very comprehensive so it can find otherwise hidden problems on machines that appear to work normally. With many chipsets, MemTest86 allows counting of failures even in error-correcting ECC DRAM (without special handling, error correcting memory circuits can mask problems with the underlying memory chips).
  Some errors manifest intermittently or depend on the precise bits being stored, and do not occur on each pass; such errors may be revealed by running many passes over an extended period. Some tests use different data each pass to reveal data-dependent errors.
caption: Detections of faulty memory are displayed prominently. The application shows which memory locations failed and which patterns made them fail.
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