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MemTest is a RAM tester that runs under Windows. It verifies that your computer can reliably store and retrieve data from memory. A correctly functioning computer should be able to do this with 100% accuracy day in and day out. A computer that fails these tests, perhaps because of old hardware, damaged hardware, or poorly configured hardware, will be less stable and crash more often. Even worse, it will become even less stable over time as corrupted data is written to your hard disk.

By running MemTest you can ensure that your computer's RAM is correctly functioning. It is wise to test this when you buy a new computer, install new RAM, or change the configuration of your machine (for instance, to overclock it). Are you the sort of user who likes to push the performance of your machine to the edge? Relying upon whether your machine will boot after your new BIOS tweaks is a poor way to determine the safety of your new settings. Use Mem Test as a true test of stability.

New in version 6.0: optimized for computers with >4GB ram. Particularly significant for Deluxe users. If you are testing 8GB or more you need this version. If testing less than 4GB, 5.x may actually be slightly faster. Based on extensive empirical research we have updated the percent coverage metric; testing to 100% will catch all errors except for intermittent failures; to detect intermittent problems test to 400%.
New in version 5.1: /nice switch, and test starts faster
New in version 5.0: 30% faster than 4.x!
New in version 4.6: After detecting a memory error the Windows version offers a link to more information and set-by-step diagnostic directions.
New in version 4.5: significantly improved hardware compatibility for MemTest Deluxe bootable CD.
New in version 4.1: Improved Windows 7/8 support.
New in version 4.0: The MemTest Deluxe bootable CD now supports 32-bit and 64-bit CPUs.
New in version 3.8: The Pro version now supports command line control of how much RAM to test and when to stop testing, and can automatically spawn multiple copies of MemTest to maximize the amount of RAM tested.