The 64bit era was here, DDR4 was coming, UEFI had already arrived and Microsoft's Secure boot technology threatened to prevent MemTest86 from booting on future PC hardware. This was around the time that a lot of technological changes were occurring. In Feb 2013, after another long period of not much development, PassMark Software took over the maintenance of the original MemTest86 project from Chris. MemTest86 (the original) and the plus version exchanged a bunch of source code in this period.

The original MemTest86 was continued to be developed across 2004 to 2013, with multiple updates made - most notably the stable Version 4.0 release. Nevertheless, both Memtest86s subsequently continued to be developed. The naming was unfortunate as it now leads to total confusion between users. MemTest86 was released as free open source (GPL) software during this period.īetween 2002 – 2004 (during the time period of the MemTest86 V3.0 release and there wasn't much activity from Chris) the code was 'forked' by Samuel Demeulemeester (formally part of the French CanardPC publishing group in France) into another version of the software called MemTest86+. Between 19, support for 64bit was added (but only via PAE paging), new CPU types, symmetrical multiprocessors and many other features have been added during this period. Since then, there have been more than a dozen new versions released. However, 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 (an old super computer) architectures. MemTest86 (without the plus) was originally developed by Chris Brady (BradyTech Inc) with a first release in 1994.

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