Supermicro X9SCM memory issues


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I've been using the X9SCM for some years now. In the beginning i added (the absolutely correct) 4x 4GB non-buffered ECC memory, and i noticed that sometimes the board didn't boot (memory errors) or it did boot but unraid crashed after an hour, or a day. After a lot of testing i found out that if i just used the first 3 of the 4 banks (in the order DIMM2A, DIMM2B (the blue ones) DIMM1A) all worked fine, but if i also added memory to the last bank (DIMM1B) the errors reoccured... Fed up with it i decided 12GB was enough at the moment.

 

But now i'm in need of more memory, and recently i bought 4x 8GB modules (again, the correct ones according to the manual) also hoping that this time i could use all four modules, assuming there was some sort of incompatibility or other issue with the 4GB ones. But again, once i add the 4th 8GB module to the last (DIMM1B) slot, the system crashes after some time. Can take an hour, or a day, but it will become unresponsive and the only way is to pull the plug... with 3x 8GB the system runs fine. No problems at all. It is up 24/7 for weeks now.

 

I know this is not a very new or modern board, but i was hoping if this was familiar to someone? Or maybe anyone has an idea what is going on? Is this a known issue with this board? Am i missing some BIOS setting?

 

I mean 24GB in stead of 32GB is more than enough for my purpose at the moment, but i purchased 32GB and i want to see 32GB in unraid's system info! :) 

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Yeah, could be some hardware fault in the specific slot. I've cleaned it with air from an air-can and a anti-static brush, but did not help. Maybe there is a pin just a bit out of place, who knows. Btw, this is an Intel platform as well, the motherboard brand is Supermicro (server board).

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You may check does any circuit track have problem and try to fix it.

 

I have 2 major memory incident, 1 module went bad and 4 new module burn by mainboard during expansion, but all problem fix after RMA replacement and change another mainboard.

Edited by Benson
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