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Re: Memory errors on new memory in new system

On 28/11/12 10:17 AM, Ralf Mardorf wrote:
In the absence of an updated Debian install (it's wiser not to update a
digital audio workstation too often) I used another install of current
Ubuntu Quantal 64-bit, Memtest86+ v4.20 and instead running it from the
same Parted Magic live CD, I run it from the lastest Parted Magic 64-bit
Live CD, also Memtest 86+ v4.20.

Ubuntu's Memtest still claims that my RAM is broken, Parted Magic's
Memtest still claims that my RAM is ok. Intense RAM usage for more than
8 hours a day and never turning the computer of since several days and I
had not a single RAM issue. I don't had RAM issues for the last
years ;).

So it's very likely that the RAM is ok ;).

Perhaps you should run Memtest86+ from
http://partedmagic.com/doku.php?id=downloads too.

And even if this should fails too, it doesn't mean that RAM is broken.
OTOH if your RAM passes the test there's no guarantee that the RAM is

Memtest86+ can help to find a broken RAM, but it's not a secure test,
when there's no suspicion for new RAM.

I disagree. My experience with MemTest86+ has been that when it detects errors, you have a problem.

The other side of the issue is that memory can test OK but that doesn't mean your memory is being accessed reliably. Klaus Knopper recently reported, and I can confirm, that sometimes chipsets aren't able to handle simultaneous disk and memory access at full speed. This isn't a RAM problem - it's either a chipset problem or a BIOS problem where the manufacturer pushes the memory timings to the limit only to have them fail in real use.

I recently also had a problem where a memory stick failed and the replacement (under warranty) tested OK but wouldn't work with the other stick in the pair. Each stick tested OK but they failed when used together.

In all cases, slowing the memory speed down can help. The real fix is for motherboard manufacturers to do better testing when setting the BIOS timings for different memory types. A clean test with MemTest86+ doesn't mean that your board will actually work in the real world - especially as it ages.

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