Memtest86+ scans your RAM for errors.
This tester runs independently of any OS - it is run at computer boot-up, so that it can test *all* of your memory. You may want to look at `memtester', which allows to test your memory within Linux, but this one won't be able to test your whole RAM.
It can output a list of bad RAM regions usable by the BadRAM kernel patch, so that you can still use you old RAM with one or two bad bits.
Memtest86+ is based on memtest86 3.0, and adds support for recent hardware, as well as a number of general-purpose improvements, including many patches to memtest86 available from various sources.
A convenience script is also provided to make a grub-based floppy or image.
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