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Memtest86+, the little RAM tester, flexes FOSS muscles with v7.0
(www.theregister.com)
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This tool is a godsend at the time when you suspect your RAM has developed a fault.
Even when I don't suspect it, I systematically run it on any new PC I build just to ensure I'm running with good RAM out-of-the-box. So far I've had this issue only once with a brand new pair but I'm glad I caught it early on.
I had a 6 month old Acer laptop that started misbehaving so I ran Memtest, it took hours, but found faults in the memory. So I took it back to the shop, they sent it on to Acer who sent it back saying Linux was the problem and I should only use windows. But they replaced the main board, "just in case"