Boots from a USB flash drive to test the RAM in your computer for faults.
Utilizing algorithms that have been in development for over 20 years.
Why use MemTest86
Unreliable RAM can cause a multitude of problems. Corrupted data, crashes and other unexplained behaviour.
Bad RAM is one of the most frustrating computer problems to have as symptoms are often random and hard to pin down. MemTest86 can help diagnose faulty RAM (or rule it out as a cause of system instability).
MemTest86 is often used by system builders, PC repair shops, overclockers, computer enthusiasts & PC manufacturers
What is Memtest86?
MemTest86 is the original, free, stand alone memory testing software for x86 computers.
MemTest86 boots from a USB flash drive and tests the RAM in your computer for faults using a series of comprehensive algorithms and test patterns.
The History of Memtest86
Memtest86 was orignally developed by Chris Brady (BradyTech Inc) with a first release in 1994. However, it is interesting to note that some of the testing algorithms used have been under development since 1981 and were previously implemented on Dec PDP-11, VAX-11/780 and Cray XMP architectures. Since then, there have been more than a dozen new versions released. Support for 64bit, new CPU types, symmetrical multiprocessors and many other features have been added during this period. MemTest86 was released as free open source (GPL) Software.
Between 2002 - 2004 (during the time period of the MemTest86 V3.0 release) the code was 'forked' by Samuel Demeulemeester (now part of the French CanardPC publishing group) into another version of the software called MemTest86+. The naming was unfortunate as it now leads to much confusion between users. Nevertheless, both Memtest86s subsequently continued to be developed.
The original MemTest86 was continued to be developed across 2004 to 2013, with multiple updates made - most notably the Version 4.0 release. In Feb 2013, PassMark Software took over the maintenance of the Memtest86 project from Chris. This was around the time that a lot of technological changes were occurring. The 64bit era was here, DDR4 was coming, UEFI had already arrived and Microsofts Secure boot technology threatened to prevent MemTest86 from booting on future PC hardware.
Starting from MemTest86 v5, the code was re-written to support self-booting from the newer UEFI platform. The software still remains free to use without restricitons. The Memtest86 v4 project is still maintained and remains open source, for use on old machines with BIOS. However, from V5 with the latest release being V8.3 the software is being released under a proprietary license. Development on the MemTest86+ version seems to be discontinued as there have been no updates since 2013.
Run from USB
You can run Memtest86 directly from a USB drive. No network connection required. Perfect for IT admins, technicians and computer enthusiasts on the go.
of different RAM testing
and DDR2 & DDR3 support
high performance memory profiles
The new graphical standard for BIOS
As of version 5, MemTest86 is native 64-bit code
support for error-correcting code RAM
With MemTest86 being code signed by Microsoft
and mouse support
support (Chinese, German & more)
Self-booting off USB
without needing DOS, Linux or Windows
Network (PXE) boot
Scalable, disk-less provisioning from a PXE server
of results to disk
Why test your RAM?
Unreliable RAM can cause a multitude of problems. Corrupted data, crashes and unexplained behaviour.
Bad RAM is one of the most frustrating computer problems to have as symptoms are often random and hard to pin down. MemTest86 can help diagnose faulty RAM (or rule it out as a cause of system instability). As such it is often used by system builders, PC repair stores, overlockers & PC manufacturers.
Windows Vista, Windows 7, Windows 8, Windows 10, 2003 Server, 2008 Server, 2008 R2 Server, 2012 Server, 2012 R2 Server. Available for both 32-bit and 64-bit platforms.
256 MB RAM, DirectX 9.0c, DirectX 11 for GPGPU tests, 225MB disk space (more required to run the disk test). Hardware loopback plugs for port testing (Professional Edition only).