Memtest86+ is a free, open-source standalone memory diagnostic utility used to isolate and identify faulty computer RAM outside of the operating system. By booting directly from a USB flash drive, it can comprehensively stress-test your memory hardware using a series of specialized algorithms without any interference from Windows, Linux, or system drivers. The Difference: Memtest86+ vs. PassMark MemTest86
It is common to confuse the two utilities, but they are maintained by different entities: Troubleshoot Bad RAM Modules with MemTest86+ – PCWorld
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