Download Memtest86 9.1 build 1000

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PassMark Software has released version 9.1 of Memtest86. With this program, the internal memory can be rigorously tested to reveal any problems. Memtest86 was developed by Chris Bradly in 1994 and at the beginning of 2000 the perhaps even more famous Memtest86 + was created as a fork, which often leads to confusion. Since 2013, it has been owned by PassMark Software and is available in a free and paid format performance. Below you can find the changelog since version 9.0, which was released at the beginning of this year:

Version 9.1 (Build 1000)

Fixes / Enhancements

  • Fixed parsing of SMBIOS memory device structure for compatibility with DDR5 DIMM data
  • Fixed non-page aligned addresses for ADDRLIMLO / ADDRLIMHI configuration file parameters
  • Fixed hang when running in UEFI Shell caused by improper cleanup of localization strings after an exit from a previous MemTest86 run.
  • Added support for retrieving CPU info for Intel Rocket Lake chipsets
  • Added support for retrieving CPU info for Intel Tiger Lake chipsets
  • Fixed misalignment of text containing full-width characters

Version 9.0 (Build 2000)

Fixes / Enhancements

  • Fixed text disappearing in the main menu for certain boards (eg. Thinkpad)
  • Fixed artifacts appearing in icons due to improper handling of transparency channel
  • Restored option to set # of passes for Free version
  • Fixed drawing issues in Upgrade to Pro screen when hovering mouse over sidebar
  • Fixed display issues in console mode for certain boards (eg. Supermicro)
  • Fixed double temperature offset being applied to certain Ryzen (AMD 17h) chipsets

Version 9.0 (Build 1000)

New Features

  • Support UEFI-based ARM systems (arm64 / aarch64), including memory test algorithms ported to ARM64 and optimized using hand-written assembly code. Special thanks to Simula eX³ project ( for providing high-end ARM64 systems for testing.
  • Added BADRAM & badmemorylist formatted strings and instructions in the exported HTML report to mask defective memory addresses (Pro only)
  • Revamped RAM SPD screen in the Main Menu with graphical view of all RAM slots
  • Added preliminary support for DIMM temperature reporting (when supported by DIMM)
  • Added option to change save location of logs / reports to another disk volume (file system)
  • Added prompt on various exit options (shutdown, reboot, exit to BIOS) on application exit.
  • Added keyboard shortcut (F12) to save screenshot to file within the Main Menu
  • Support for saving test results to a byte-packed, binary file for storage-limited systems
  • Support for passing configuration parameters via command line arguments
  • Added new config file parameter, ‘EXACTSPDSIZE’, to specify the total capacity of all detected SPD to match before allowing tests to begin
  • Added new config file parameter, ‘MEMREMMB’, for specifying the minimum amount of memory to leave unallocated during testing
  • Added new config file parameter, ‘MINMEMRANGEMB’, for specifying the minimum size of memory ranges that shall be allocated for testing
  • Added new config file parameter, ‘AUTOREPORTFMT’, for specifying report format of auto-saved reports
  • Added new config file parameter, ‘PMPDISABLE’, to disable TFTP uploading of XML messages for Management Console integration
  • Added new config file parameter, ‘RTCSYNC’, to sync real-time clock with PXE server (via a periodically updated ‘CurrentTime.txt’ served by the PXE server)
  • Added new config file parameter, ‘VERBOSITY’, for specifying the verbosity level of the debug output
  • Added new config file parameter, ‘TPL’, to specify the UEFI task priority level of the MemTest86 application

Fixes / Enhancements

  • Support for per-baseboard configuration file via baseboard-prefixed filename (eg. “Surface Pro-mt86.cfg”)
  • Optimized / removed stale 32-bit code in memory tests
  • Improved test coverage by alternating between ascending / descending assignment order of CPU cores between passes when running in parallel mode
  • Track CPU core / thread ID of detected memory errors, and include the list of CPUs in error in test summary / report
  • Added tracking and reporting of min / max / average CPU + DIMM temperatures (when supported by DIMM)
  • Added SMBIOS memory device info to reports
  • Modified DRAM address ECC error reporting from (Column, Row, Rank, Bank) -> (Channel, Slot, Rank, Bank, Row, Column)
  • Added serial number of DIMM module experiencing ECC errors in report (supported chipsets only)
  • Added channel / slot information of detected SPDs in report (supported chipsets only)
  • Fixed 100% CPU usage when waiting for input in main menu
  • Improved UI drawing performance for better responsiveness
  • Generate beeps of Piezo Speaker on test end (if available)
  • Changed to large, colored PASS / FAIL message box on test end
  • Changed to large, colored FAIL message box on failed pre-test SPD checks
  • Fixed Test 12 errors in HTML report being truncated
  • Updated blacklist to work around new UEFI bugs Apple added to their UEFI firmware
  • Updated blacklist to work around Microsoft / Huawei laptops with display issues related to screen resolution
  • Fixed crash on VirtualBox due to reading of non-existent MSRs
  • Include system information details in TestResult XML messages to PXE Server (Site Edition)
  • Display error when there is a TFTP transfer error when sending Status XML messages to PXE server (Site Edition)
  • Fixed escaping of chars to XML entities when generating messages to PXE Server (Site Edition)
  • Output additional lines to console during MemTest86 boot
  • Fixed detection of uncorrected ECC errors for AMD Ryzen chipsets
  • Fixed ECC detection for> 2 channels for AMD Ryzen chipsets
  • Fixed ECC support for multiple CPU dies for AMD Ryzen chipsets
  • Fixed ECC error detection on AMD Ryzen chipsets with multiple CPUs
  • Added preliminary support for AMD Ryzen ECC reporting via error count registers when PFEH is enabled
  • Fixed ECC detection for Intel chipsets that use error count registers
  • Added ECC support for different Intel Coffee Lake chipset variants
  • Added disabling of SMI for Intel Kaby Lake chipsets to allow ECC errors to be detected
  • Added ECC support for Intel Comet Lake chipsets
  • Added preliminary support for decoding of system address to socket / channel / rank / bank / row / column address on Broadwell-DE. This information is logged in the log file.
  • Fixed incorrect reporting of ECC capabilities for chipsets with multiple IMCs
  • Added support for retrieving CPU info for Intel Gemini Lake chipsets
  • Added preliminary support for retrieving CPU info for Intel Ice Lake chipsets
  • Fixed potential unstable behavior when increasing the target multiplier for Intel Silvermont chipsets
  • Fixed enabling turbo mode on Intel Silvermont chipsets
  • Updated temperature offsets for AMD Ryzen chipsets
  • Added preliminary support for reading AMD Ryzen 5000 (Family 19h) chipset temperatures
  • Updated EDK2 library to edk2-stable202008
  • Fixed memory leak when exiting program
  • Revised Portuguese translations
  • Updated unifont.bin file with higher weight Russian glyphs
  • Removed PassMark contact information from reports

Version number 9.1 build 1000
Release status Final
Website PassMark Software
License type Freeware / Paid
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