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2GB of XMS RAM - 1GB of which is bad

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I recently purchased a pair of Twinx 2048 RAM modules and I believe one of them is bad. When I have both on my system, Windows traps and rebooted itself. I then went ahead and test them individually using Memtest86+ and one of them passed with flying colors (1.5 hrs), but the other gave all sorts of memory failures fairly quickly. I used as well as and 2.6v as well 2.7v. All to no avail. The screen test for the bad module looks something like this:

Tst Pass Failing Address Good Bad Err_Bits Count

5 0 00004194860-65.2MB 00000004 00003a04 00003a00 1

5 0 00005194840-81.2MB 00000004 00003a04 00003a00 1

5 0 0000a994980-169.2MB 00000008 0000ba08 0000ba00 1



Here is what's printed on the RAM module:

CMX1024-3200 XMS3200v5.1 / 0601013-1

XMS 3200 1024MB 400Mhz


My system:

P4 3.2EE, DFI LanParty Pro875B RevA, nVidia 6800GT, Antec P160 with Antec Phantom 500 PSU.


I would like to RMA and have the bad module replaced if I could. Please let me know if you would like me to try other tests, configurations, etc. Or if you have any questions. Thanks.

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Please load setup/optimized defaults and then set the Dim Voltage to 2.7X volts (+.2 Volts W/Giga-Byte) and then set the timings manually to the tested settings for the specific module you have, XMS3200 Cass 3-3-3-8 for example or if you have Value Select "BY SPD" and then test the module/'s one at a time with www.memtest.org! If you still get errors, please follow the link in my signature “I think I have a bad part!” and we will be happy to replace them or it! However, if you get errors with both modules that would suggest some other problem and I would test them in another system or MB to be sure.
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Followed your suggestion and still got the same errors on the bad module. I know the motherboard is okay because I used a pair of 1GB CMX3200C2PT (for a total of 2GB), borrowed from my brother and they work fine.

So I'll go ahead and RMA them and have them replaced. Thanks.

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