Memtest86 is a comprehensive, stand-alone memory diagnostic. Memtest86+ is software designed to stress test an x86-compatible computer's random access memory (RAM) for errors. It tries to verify that the RAM will accept and correctly retain arbitrary patterns of data written to it.

Memtest86+ is designed to run from a bootable floppy disk, CD-ROM, USB Drive, or from a suitable bootloader without an operating system present. Memtest86+'s tests are 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.


Memtest86 was originally developed by Chris Brady; Memtest86+ is developed by Samuel Demeulemeester. The first version of Memtest86+ was released on early 2004, based on memtest86 v3.0 that was not updated since mid-2002.

Memtest86+ writes a series of test patterns to every memory address, reads back the data written, and compares it for errors. Information about the chipset can be used to enhance these tests — particularly in an overclocked system. Many chipsets can report RAM speeds and timings, and some even support changing the memory timings on the fly; in this way, Memtest86+ can test that memory remains error-free with the more aggressive settings.

Enhancements in v4.10:
* New Features
o Added support for Core i7 Extreme CPU (32nm)
o Added support for Core i5/i3 (32 nm)
o Added support for Pentium Gxxxx (32 mn)
o Added support for Westmere-based Xeon
o Added preliminary support for Intel Sandy Bridge
o Added support for AMD 6-cores CPU
o Added detection for Intel 3200/3210
o New installer for USB Key
* Bug Fixes
o Corrected a crash at startup
o Many others bug fixes

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