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Thanks
gull04 for the link of Memtest86, I heard that a lot, but not quite sure if it is the most popular tool for Linux memory as well.
Operating system is irrelevant, memtest86 is a standalone tool. It literally needs no operating system at all(in fact, one would get in the way) -- it only requires a bootloader. It seems to come bundled with almost any kind of rescue disk there is as an afterthought -- if there's a few extra K of empty space, they stick it in as an alternate "kernel", why not. It's popular enough I haven't seen many alternatives at all.
It is x86 and x86-64 only, of course.