Ram not detected

motorboatinking · Mar 11, 2018

I am having some trouble with a stick of ram and am not sure how to continue. I bought a stick of Dell 8GB DDR3 1600 SNPRKR5JC/8G ECC ram to add to my FreeNAS machine with a SUPERMICRO MBD-X9SCM-F-O LGA 1155 Intel C204 Micro ATX motherboard. The board already had a single stick of Dell 8GB PC3-12800 DDR3-1600 SNP96MCTC/8G installed in DIMM2A and worked fine. When I added the new stick to DIMM2B and booted, it still showed as only having 8gb ram. I removed the working stick and installed the new ram into DIMM2A and the motherboard beeped indicating no ram installed.

I went to another PC with an ASUS H87I-PLUS motherboard and removed the working ram and installed the new Dell ram. That motherboard will not detect the ram in either slot.

Is there anything else I should do to test this ram or is it a bad stick?

terry4536 · Mar 11, 2018

No, return the stick of memory. I would only recommend buying memory in matched set. Although it is running on one stick, the motherboard is designed to run with dual channel memory. Another dissimilar stick of DRAM may or may not work.

motorboatinking · Mar 11, 2018

terry4536 :

I thought that was the problem at first, but when the stick did not work by itself I dismissed that as a problem.

SkyNetRising · Mar 11, 2018

The ram module is of type ECC Registered/buffered. Not compatible with any of your systems.

ASUS H87I-PLUS does not support ECC and doesn't support registered/buffered ram.
SUPERMICRO MBD-X9SCM-F-O supports ECC but doesn't support registered/buffered ram.

motorboatinking · Mar 11, 2018

SkyNetRising :

That would explain it then. I thought this was compatible with my motherboard in the FreeNAS machine but I guess got my info wrong before I bought it.

terry4536 · Mar 11, 2018

When the memory didn't work on the other motherboard either it verified that the stick was bad. But the problem of matching DRAM is still a problem.

Imagine it this way, the current stick requires X volts to run at a specific frequency. Then you add another stick, it is going to get the same voltage. But the voltage to run at that same frequency is likely different. So you end up with two sticks of memory running at different frequencies. If it is outside of the acceptable range it cause an error.

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