Memtest86+ is a free, open-source, stand-alone memory tester for x86 and x86-64 architecture computers. It provides a much more thorough memory check than that provided by BIOS memory tests.

It is also able to access almost all the computer's memory, not being restricted by the memory used by the operating system and not depending on any underlying software like UEFI libraries.

Memtest86+ can be loaded and run either directly by a PC BIOS (legacy or UEFI) or via an intermediate bootloader that supports the Linux 16-bit, 32-bit, 64-bit, or EFI handover boot protocol. It should work on any Pentium class or later 32-bit or 64-bit CPU.

What's New

  • Rewrite code for UEFI 32 & 64 bits
  • Add support for x64 Long Mode Paging
  • Add support for up to 256 cores
  • Add detection for DDR4 & DDR5
  • Add support for XMP 3.0
  • Add detection for AMD Zen 1/2/3/4
  • Add detection for Intel up to 13th Gen
  • Add better support for AMD pre-ZEN CPUs
  • Add support for older nVidia and AMD chipsets
  • Add support for SDRAM
  • Many enhancements
  • Numerous bug fixes & optimization