Memory testing tools are software programs that perform detailed tests of your computer's memory system.
The memory installed in your computer is very sensitive. It's always a good idea to test newly purchased memory for errors and a memory test is always in order if you suspect that you may have a hardware problem.
1. Memtest86
Memtest86 is a completely free, stand-alone, and extremely easy to use memory testing program. If you only have time to try one memory testing tool on this page, try Memtest86.
Simply download the ISO image from Memtest86's site and burn it to a CD. After that, just restart to boot from the CD and you're off.
While this program is free, BradyTech Inc. can ship you a CD-ROM with Memtest86 preinstalled plus detailed documentation, all for around $10 USD.
Unless you're a true novice and really need some assistance, the free download and free basic support available on the site should be enough. Just click on the "Free Download" link on the left hand side of the page, available at the Memtest86 site linked below.
2. Memtest86+
Memtest86+ is a modified and presumably more up-to-date version of the original Memtest86 memory testing program, profiled above. Memtest86+ is also completely free.
I would recommend trying Memtest86+ if you have any problems running the Memtest86 memory test or if Memtest86 reports errors with your memory and you would like a really good second opinion.
3. Windows Memory Diagnostic
Windows Memory Diagnostic is a free memory testing tool provided by Microsoft. Very similar to other memory testing programs, Windows Memory Diagnostic performs a series of extensive tests to determine what, if anything, is wrong with your computer memory.
Simply download the installer program and then follow the instructions to create a bootable floppy disk or ISO image for burning to a CD.
After booting to the CD or floppy disk, Windows Memory Diagnostic will automatically begin testing the memory and will repeat the tests until you stop them. If the first set of tests finds no errors, chances are your memory is good - it's unlikely that Windows Memory Diagnostic will find problems with repeated attempts.
4. M2K MemScope
M2K MemScope is a free memory testing software program from the makers of Micro-Scope - a large suite of professional, time tested (and expensive) computer diagnostic tools.
MemScope performs a wide variety of tests in an attempt to locate even the smallest issue with your memory. Many advanced testing options are available but the "Run All" test is equivalent to tests in other programs and is a safe bet if you're not a memory expert.
MemScope is freely downloadable from M2K's site, linked below. You will have to fill out a short form but you're quickly brought to the download link. I couldn't get the provided ISO file to work but I did use the "MemScope installer" option to create a bootable floppy disk without problem.
