MemTest86 is a memory test for x86 computers. There are free, professional and self booting editions of MemTest86 available. The pricing and feature differences can be found below. Home Product Page Technical Info Support; About Us Sign In; MemTest86. What’s New Pricing Compare Editions Screenshots. Download Buy Now. MemTest86 and Memtest86+ are memory test software programs designed to test and stress test an x86 architecture computer's random access memory (RAM) for errors, by writing test patterns to most memory addresses, reading back the data, and comparing for errors. Feature Comparison.