Memtest86+ provides a more thorough memory check than that provided by BIOS memory tests. Can be loaded and run either directly by a PC BIOS (legacy or UEFI) or via an intermediate bootloader.

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 one 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 your old RAM with one or two bad bits.