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One or many of the memory cards out of total 4GB (4x1GB) are failing. The following is memtest progress screenshot. It is always pointing to memory at 19xx MB and 50xx MB. Error bits are always 04000000. How can I determine which of those 4 cards are failing? The strange thing is that if I test them individually they are not failing. I've change Motherboard.

memtest memtest

Thanks

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Maybe the modules are mis matched? Post your Motherboard model and revision. – Moab Mar 6 '11 at 15:14
If the modules do not fail individually, then that is not your problem. I had this problem before, where I would get errors but they would be fine individually... Turns out it was the motherboard. It is possible that you have tested the memory in two damaged motherboards. Try bringing the RAM to a friend and testing it again. (Oh, and BTW, +1 for posting pictures, much appreciated) – Breakthrough Mar 6 '11 at 15:24
Also, I've noticed that the error bit is the same for each count. Was this the case with both motherboards you tested? – Breakthrough Mar 6 '11 at 15:26
@Moab: They were working for a long time and identical. MSI P45 Diamond. – Pablo Mar 6 '11 at 15:26
@Breakthrough: Like I mentioned I've exchanged mobo once and now I have exactly same issue, same error bitmask. None of friends have DDR3 compatible mobos, unfortunately. – Pablo Mar 6 '11 at 15:27
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1 Answer

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Use the process of elimination -- remove half of the modules and run the test again...

If there are no failures, then you know that these two modules are good, so put them aside and test again.

If there are failures, then cut down to half again (down to one of four memory modules now) then test again.

But, just because one failed a test, don't assume that the other doesn't fail (you could have two failing memory modules) -- where you've detected a failure with two memory modules, test each of those two separately afterwards.

Important note: With features like memory interleaving, and poor memory module socket numbering schemes by some motherboard vendors, it can be difficult to know which module is represented by a given address.

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testing them individually does not show failure. I've tested like couple hours each. – Pablo Mar 6 '11 at 17:57
+1. Try testing the modules in pairs, and if you're absolutely sure it's not the motherboard, use process of elimination to find the bad one. – Breakthrough Mar 6 '11 at 19:35
anyway... located a pair of modules which is failing. However, individually each module is not failing, only with pair and rarely. they are identical and not overclocked. – Pablo Mar 8 '11 at 16:30
Are those memory modules hot to the touch after failing a test? If so, then it could be an overheating problem (and the modules may be fine in a system that doesn't cause them to run hot). – Randolf Richardson Mar 8 '11 at 16:32

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