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RAM module gives no errors or noticable performance issues, but won't pass memory tests.

post #1 of 2
Thread Starter 
Hello everyone, and thank you in advance for not bashing on me too hard.

I have my system maxed out on everything, just about, including 8GB of Corsair XMS2 memory. I performed a memory test earlier today and was greeted with a "hardware issue" half way through. I removed all of my RAM modules and checked each module individually until I found the module with the issue. I booted the system with the single "bad" module and it booted up fine with no errors and no noticeable performance issues. Windows even recognizes the module, as well does the BIOS. It also works without error when seated in any slot (I have 4). I'm kind of confused as to what would make a module perform as though there weren't any problems, but not pass a memory test. I have never encountered such an issue. Usually a bad module will generate post errors, BSOD, and/or program crashes, but none of that is occurring. I have run the machine for more than 48 hours continuously with all four modules and no issues at all. I'm sure it's not a good idea to run the module at all now that I know it's "bad", but I was hoping to get some input about the issue from someone who has seen or experienced this type of "functioning error". Any and all insight would be welcome. Thanks.
post #2 of 2
This is absolutely normal. Sometimes faulty RAM modules do not even POST, sometimes they boot and immediately generate errors, sometimes it takes time to spot faults.
Quote:
Originally Posted by GenuineGemini View Post

I'm kind of confused as to what would make a module perform as though there weren't any problems, but not pass a memory test.
Imagine there is only one faulty 2Mb sector on a 2Gb module .. you figure out the chances to stumble on it with a process that will generate an OS crash.
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