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Possible Duplicate:
MemTest is returning large numbers of errors in Test 7, no matter what ram I use
I was having trouble with my Ubuntu box so I ran memtest86 and there were failures. I installed some brand new RAM, set the BIOS settings and ran memtest86 again. Still failing.
I tried both banks together and individual banks and always get loads of errors when it gets to the Random Number Sequence tests. Up to that point, everything passes.
I'm extremely doubtful that both sets of RAMs would be faulty.
So what else could cause the errors?
It's possible the DIMM slots themselves have bad connectivity, that the motherboard's memory controller is corrupted, that the memory interface unit in the CPU is bad, and lastly, that the CPU itself is bad. You can run Prime95 to test your CPU; as for the motherboard, try your best to find a good stick of RAM, and isolate the issue from there. – Breakthrough – 2012-11-21T11:55:47.557
This is a known bug in the Memtest86+ distributed with Ubuntu 12.10. See my answer to this duplicate question.
– Vincent Yu – 2012-12-09T21:59:12.290