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Faulty RAM ?


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I received the memory module (Corsair CMSS1GB-333SOD) I ordered today and installed it in my system (Apple PowerBook G4 1.25GHz). I took out one of the 256MB chips in my machine and installed the 1024MB chip in the top bay.


When I restarted everything seemed to work as it was supposed to, but after a while (after I had started a few applications) the applications started crashing, with my terminal applications stating a bus error (memory error) - this was with JBoss.


To verify I took out the other 256MB chip as well and ran the computer with only the 1GB chip installed. This led to the machine crashing on startup 3 times (just as the system were booted). The 4th time I was able to run memtest on the avaliable RAM, which caused the system to crash (kernel panic) after reaching Stack Address sequene 5, stating:


Currupt stack and Memory Acces Exception (1,0,0), upon I had to shut down my computer.


I shut the computer down and re-installed my original 2 memory modules. booted the computer and ran memtest without trouble.




I sent this email to the shop I bought it from, and received the following reply:


We've not received any significant comments from Apple users regarding this RAM - you may have to configure something in the BIOS, however, if the size is significantly different from the originally installed module.


Check with Apple to see if there is anything you need to do to deal with such a large module, and you may also want to ask the RAM guy at the corsair forums, as they usually respond very quickly, and are more likely to know if there is something you need to do with your config.






could this be due to faulty RAM ?

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It could be, can you get into the bios and load setup defaults?


There is no BIOS on the mac. The Mac has a ROM, but this is not user configurable, but auto detects any hardware you might have in the machine. The module is recognised correctly by the system an it is able to use it (for a short time before everything crashes).


The response from the company I bought the memory from replied with:



We've had no faulty modeuls of CMSS at all, despite selling more than 100 of them so far. They are pre-tested by Corsair prior to packaging, so I'd doubt that they would package a faulty module.



So I did some more tests in memtest, that to me says "bad memory":


For the first sequence there were "only" a few failiures:


Sequence 1:

Stuck address: ok

Random value: ok

Compare XOR: ok

Compare SUB: ok

Compare MUL: ok

Compare DIV: ok

Compare OR: ok

Compare AND: ok

Sequential increment: ok

Solid Bits: ok

Block sequential: testing 43FAILIURE: 0x2b2b2b2a != 0x2b2b2b2a at offset 0x01eba351

Checkerboard: testing 7FAILIURE: 0xaaaa55aa != 0xaaaaaaaa at offset 0x05964080

FAILIURE: 0x555555aa != 0x55555555 at offset 0x05964081

Bit spread: ok

Bit Flip: testing 2FAILIURE: 0xffff00fe != 0xfffffffe at offset 0x022da820

FAILIURE: 0x000000fe != 0x00000001 at offset 0x022da821

Walking ones: testing 0FAILIURE: 0xfffff01 != 0xfffffffe at offset 0x00818021

Walking zeroes: testing 4FAILIURE: 0x0000008 != 0x0000010 at offset 0x0777801


For the second sequence it failed almost instantly (at test 0) on every point, and on the third sequence it returned the following while testing for Stuck address:


Possible bad addres at offset 0x03bb0961


I stopped memtest, which is where the system crashed (kernel panic), so the above is what I noted down with a pen and paper. I did take a photo of the screen after the kernel panic, which I put up on: http://www.devsiden.info/images/badmemory.jpg (1.3 MB)


It does look like me like a faulty chip...

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  • Corsair Employees

We can sure try replacing them or it if you like.

Please follow the directions under "I think I have a bad module" under this forum or if you have trouble, Please send us a email with a copy of the form or all of your info name address and phone# and the Module part# and copy the link to this post and email it to Rma@corsairmemory.com.

If after 1 day or 24 hours excluding weekends you do not get the RMA please email the same to warranty@corsairmemory.com and we will help to resolve it.

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