Nuc10i5 only sees 8GB on each 16GB SODIMM

[rodders]

I have a NUC10i5FNH with 2x 16GB SODIMMS installed from the verified list (Corsair 16GB 2400MHz CMSX32GX4M2A2400C16) so each DIMM is 16GB. I have verified the memory works on another system and they are 2x 16GB DIMMS.

I am running version BIOS version FN0057 which is the latest for this system and running Ubuntu 22.04 from a NVMe drive.

The problem is the BIOS only sees 8GB on each DIMM. The system is stable and boots Ubuntu ok but only 8GB per DIMM is seen rather than the 16GB per DIMM expected.

Suggestions anyone?

Many thanks

[n_scott_pearson · Accepted solution]

What happens if you remove one of the SODIMMs? Does it see 16GB then or just 8GB?

Are you sure it isn't seeing 16GB from one SODIMM and nothing from the other?

...S

[rodders]

Hiya,

Many thanks for the suggestion and question. To confirm the BIOS was indeed telling me I had an 8GB DIMM in each slot even though they were 16GB DIMMs - yes very bizarre. I followed your suggestion of using a single DIMM and found once the top DIMM was removed the BIOS recognised the full 16GB in the remaining slot. Reinserting the top DIMM resulted in the system having multiple restart attempts before recognising the top slot as having 16GB as well. So problem solved! 

However I suspect there was something very weird happening (memory training?) given that the BIOS only reported 8GB from each 16GB DIMM initially. Going down the route of a single DIMM and then adding the second did resolve the problem and I suspect that process forced the system to rediscover the memory DIMMS correctly. I don't suppose it's high on anyones priority to do a root cause analysis on this but I'll remember this process when the system gets upgraded to 64GB in the future.

So the outcome is a success and many thanks for the suggestion and assistance. 

Regards,

R.

[n_scott_pearson]

You are not the only person seeing a strange issue when using Corsair memory. I stick with Crucial as much as I can. 

...S