Memtest86 is a standalone memory diagnostic tool that runs from a CD on system boot. It executes a series of numbered test sections to check for errors. These test sections consist of a combination of test algorithm, data pattern and cache setting. The execution order for these tests were arranged so that errors will be detected as rapidly as possible. Tests 8, 9, 10 and 11 are very long running extended tests and are only executed when extended testing is selected. Memtest86 supports all types of memory and can be run on any operating system. You will download an ISO file that you can burn to CD. Memtest86 only works with 32-bit computers.