Memtest86 Free Edition is a memory testing software for computers. It boots from a USB flash drive or DVD and tests the RAM in your computer for faults using a series of comprehensive algorithms and test patterns.

Memtest86 Free Edition is also available in Professional and Site editions, each offering different, additional features. A feature comparison is available here.

As any tech knows, RAM can cause many problems and is frustrating and difficult to diagnose. MemTest86 can rule out faulty RAM and can run while you do other things.

You will need a blank CD\DVD and a program to burn an ISO image for the ISO download. BurnAware is one of the better, free choices.

Features:

-Bootable from USB
-UEFI BIOS Support
-Multiprocessor Support
-DDR2 / DDR3 Support
-DDR4 Support
-XMP Support
-Secure Boot1
-Native 64-bit code
-Native USB keyboard support2
-GUI w/ Mouse Support
-RAM SPD and XMP details
-Disk logging
-Report file generation
-ECC feature detection
-ECC error polling
-New Row hammer test
-RAM benchmark graphs

Similar:

How to Use the Windows Memory Diagnostic Tool in Windows

How to Check Your Memory (RAM) Speed, Available Slots and More

How to Update and Find Your Windows Experience Index Score

How to Identify the Hardware in Your Computer

Limitations:
The free edition contains the features displayed above. Starting at $44.00 you gain access to the following additional features:

Customizable Reports

ECC error injection3

Disable CPU cache option

Configuration file4

Full test automation (via config file)

New 64-bit/SIMD tests7

New Row hammer test

Saving RAM benchmark reports to disk