From PassMark Software:
MemTest86 is the original, free, stand alone memory testing software for x86 computers. MemTest86 boots from a USB flash drive or CD and tests the RAM in your computer for faults using a series of comprehensive algorithms and test patterns.
Unreliable RAM can cause a multitude of problems. Corrupted data, crashes and unexplained behavior. 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 does NOT run in Windows. To use the software you need to copy the files to a flash drive. This wipes the existing content of the flash drive, but makes the drive bootable. Often you need to change the boot order in BIOS to select the flash drive as the boot drive.
Once booted, MemTest86 runs through thirteen different tests as well as reporting on the specifications of the RAM installed in the machine.Tests can take between 30min to several hours to run, depending on your hardware and the amount of RAM installed.
Other features include support for DDR3, DDR4, UEFI, XMP, 64bit, secure boot and ECC RAM.
What's new in this version:
- UEFI BIOS support, including secure boot.
- DDR4 support, including XMP
- Row hammer testing
- 64bit native code
- Foreign language support, French German, Japanese, Chinese
- ECC RAM support for server class CPUs
- Writing of test reports to the USB drive