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running unmatched set of TWIN2X4096-6400C5C for 6 months and then it stops working


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I had been running with two pair of TWIN2X4096-6400C5C for about 6 months with no problems and then suddenly they have decided to stop working together. I ran memtest 6 months ago and everything was stable. But now memetest give all sorts of errors with the 4 sticks.


Each pair is matched, but all 4 sticks are not matched together.


Yes I know this is not guaranteed to work!






I did try increasing voltage and decreasing frequency from 800 to 667 per:





but it was never stable.



I am solving the problem by going back to the standard voltage and timings and only using 2 sticks of ram. I am currently in the middle of an extended memtest run on the memory just to be sure everything is stable.


Two questions:

1) Anything else I could try to attempt to get the 4 sticks to work together?

2) How can it work with no issues for 6 months then stop working?





Ram: Corsair TWIN2X4096-6400C5C

Motherboard: Asus P5N7A-VM (with latest bios)

CPU: Intel Pentium Dual-Core E6500

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  • 2 weeks later...

Any thoughts on my questions?


I may try and swap out memory with another identical build and see if I have any better luck running 4 sticks of ram with a different set of memory. The memory again the same model (TWIN2X4096-6400C5C) just physically different sticks. Maybe that will make a difference.

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Thanks for the response. Kind of what I figured.


Tried to swap out the ram, but when I ran memtest on the other computer memtest locked up. No errors, but the program froze. Looked like it was some sort of a display problem which maybe has to do with the fact that the motherboard has onboard video and so the ram is shared with video ram.


Seems like that ram may be a bit flakey even though it seems to pass memtest.


I will probably test a bit more if I get a chance.


Honestly I would probably just buy new 8GB if DDR2 ram wasn't so outdated/expensive!

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