MemTest64 vs MemTest86+

MemTest64 is a free, standalone Windows utility for checking system memory for hardware-level problems. It runs inside Windows with a graphical interface, loading physical memory with test patterns and applying detection algorithms that identify errors automatically. You choose how much memory to test, which can limit the effect on other work. The utility runs without a reboot or DOS mode, does not require administrator privileges, needs no installation, and makes no registry changes. Listed processor support includes modern Intel Core and AMD Ryzen systems. Supported systems are 64-bit Windows XP, Vista, 7, 8, 10, and 11. TechPowerUp describes it as useful to overclockers adjusting memory timings and DRAM speeds. The utilities listing identifies version 1.0, dated April 20, 2017, and the product page links to a support forum.

MemTest86+ is a free, open-source stand-alone memory tester for x86, x86-64, ARM AArch64, and LoongArch64 computers. It uses algorithms including moving inversions and Modulo-20 to detect memory failures and investigate crashes, freezes, or system instability. The tester can access almost all computer memory without operating-system memory or UEFI library restrictions. It can run from legacy or UEFI BIOS, through Linux boot protocols, or from a FAT32 USB flash drive, CD-ROM, or PXE network boot. For PXE, the project documents different binaries for BIOS and UEFI boot as iPXE or PXELINUX payloads. Testing continues indefinitely, with the pass counter advancing after all selected tests finish. The software is licensed under GNU GPL version 2, with no additional restrictions on private or commercial use. Stable and nightly binaries are available, though nightly builds are generated automatically and are untested and unsupported. Secure Boot must be temporarily disabled because the binary is not signed by Microsoft. USB drivers remain in progress, and not all USB devices are supported.