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Memtest86 is a free, standalone memory test software for x86 and Arm computers. It boots from USB flash drives to test your computer’s RAM for errors, using algorithms that have been in development for over 20 years.

Unreliable RAM can cause a number of problems. Corrupt data, crashes and other inexplicable behavior. Bad RAM is one of the most frustrating computer problems, as the symptoms are often random and hard to figure out. MemTest86 can help diagnose faulty RAM (or rule it out as a cause of system instability).

Does MemTest86 check RAM and CPU?

No, MemTest86 is a memory-only test tool for x86 and arm PCs. MemTest86 boots from a USB flash drive and tests the RAM in the computer for errors using a series of comprehensive algorithms and test patterns.

Does Memtest86 affect RAM?

Memtest86 will load your CPU up to 100% during testing, because data read or written to RAM will pass through the CPU, but it should not damage your processor or RAM.

How many errors in Memtest86 is acceptable?

MemTest86 performs a series of numbered test sections to check for errors, and there should be 0 errors. You can read a description of each of the test parts here.

Can MemTest86 fix errors?

Memtest86 only detects physical errors in the system memory, but cannot fix any errors. If your RAM is bad from a memtest, you should first update your motherboard’s BIOS or consider buying new RAM.

Is MemTest86 compatible with Linux?

MemTest86 does not require any operating system for execution. The version of Windows, Linux or Mac used on your machine is irrelevant to execution.

MemTest86 supports all current technologies:

• 13 different RAM test algorithms – including radhammer error detection*
• All RAM types supported (DDR2, DDR3, DDR4, DDR5, SODIMM, XMP, ECC)
• Self-booting from USB or network (PXE)* boot, no need for DOS, Linux or Windows
• Optimized for UEFI-based x86/ARM systems
• Native 64-bit code (since version 5)
• ECC error detection and injection*
• Secure Boot Verified – Code signed by Microsoft
• Graphical interface with mouse input
• Save logs and create customizable HTML reports
• Full test automation via configuration file
• Support for blacklisting memory in Windows (badmemorylist) and Linux (BADRAM)
• Multilingual support (Chinese, German, Russian, Spanish and more)

MemTest86 relies on industrial use (PC/CPU/Motherboard/RAM manufacturers) and consumer use (system builders, overclockers, computer enthusiasts).

What is new

Since MemTest86 V10 only supports the newer UEFI platform, older PCs without UEFI support will not be able to boot MemTest86. To run MemTest86, PCs with older BIOS platforms must use the older V4 version of MemTest86.

New features

• Added new experimental memory test as test 14 [DMA test]. This test trains the disk controller’s DMA hardware to perform memory accesses by bypassing the CPU. The motivation for this test came from discovering a faulty RAM module that did not fail when accessed via the CPU, but failed when reading files from disk via DMA. Since this test is experimental, it should be disabled by default.
• DIMM (Pro Edition)/Chip Level (Site Edition) error detection on a limited number of hardware platforms. This includes mid-test error reporting, graphical UI summary report of test completion, and error count table per DIMM/chip in the HTML report.
• Added new configuration file parameter, ‘CPUMAP’, to specify the DRAM chip labeling map. By default, DRAM chips are marked consecutively from U0 (eg U0, U1,…, U15)

Corrections / improvements

• The log file name now includes the timestamp
• Added new blacklist flag ‘DISABLE_CPUINFO’ to disable CPU information collection
• Fixed ‘MAXCPUS’ config file parameter not being used
• Fixed hammer test running incorrectly in single sided mode in free version
• Fixed clock speed measurement error for ARM chipsets due to the cycle counter register not being enabled
• Fixed detection of MAC address used as unique ID for PXE boot
• Added support for reporting IBECC errors
• Fixed bug when reading ECC error count registers for various Intel/AMD Ryzen chipsets
• Fixed ECC error status register reading for Intel Tiger Lake-H and Alder Lake chipsets
• Fixed ECC detection on Intel Ice Lake-SP chipsets
• Added support for ECC detection for multi-socket Intel Ice Lake-SP chipsets
• Fixed ECC support for Intel Rocket Lake chipset variant
• Added ECC support for AMD Ryzen Zen 3 50h-5fh chipsets
• Fixed ECC support for AMD Ryzen Zen 2 chipset with 2 memory channels
• Fixed ECC error false positives on Intel Atom C2000 chipsets
• Added support for retrieving Intel Ice Lake-SP CPU information
• Added support for retrieving Intel Ice Lake-SP RAM SPD data
• Added support for retrieving Intel Ice Lake-SP RAM temperature data
• Added SMBus support (SPD) for Intel Alder Lake-P
• Enable SMBus on Intel 801 based chipsets if disabled
• Fixed detection of SPD modules on systems with > 8 SMBus controllers (eg quad-socket systems)
• Fixed bug in mapping SPD module index to SMBIOS slot index
• Fixed SPD slot detection for systems with soldered and removable DIMMs
• Fixed incorrect calculation of DDR5 transfer bandwidth
• Fixed the DDR5 memory type in SMBIOS not being correctly parsed
• Fixed identification of data partition in USB flash drive
• Create ‘Benchmark’ directory to store RAM benchmark results if it does not already exist
• Updated blacklist