Memory not recognised

[gte1978]

Dear forum,

I am building a NAS using a HP T620 thin client with a AMD GX-415GA SOC with Radeon(tm) HD Graphics .
It came with 1 bank of 4GB memory, so I added a 2nd bank of identical memory.
I am running an amd64 kernel, accoring to "uname -a"
The BIOS recognises 8GB of memory, as well as "grep memory /var/run/dmesg.boot"
However; Truenas only recognises 3.4GB (4GB).

I run Truenas latest version from the m.2 SSD, and have 5 HDD connected to it using RAIDZ1.

Can you help me, please?

 

[Ericloewe]

TrueNAS Core or Scale? Is the SoC capable of actually addressing physical memory above 4 GB?

 

[gte1978]

TrueNAS Core or Scale? Is the SoC capable of actually addressing physical memory above 4 GB?

TrueNAS CORE.

I believe that the SoC is capable.
the HP T620 thin client datasheet says it can support up to 16GB

 

[Ericloewe]

What does dmidecode say about your RAM?

 

[gte1978]

 

[Ericloewe]

One Samsung and one Crucial DIMM... I'm not saying it shouldn't work, but in the real world some systems are ridiculously picky about DRAM.

 

[gte1978]

I know...
I swapped the memory modules between rank 1 and 2, but no difference.
Not sure if that made any sense, but I am in now way an expert and was just trying to eliminate unknown potential causes.

Other than the 2 different brands, everything looks fine, right?

 

[Ericloewe]

Yeah, both models seem to be dual-rank DIMMs, so they really should work.

 

[gte1978]

I just ordered another crucial memory bank, identical to the last one.
Maybe the issue is related to dual channel memory being best ordered in pairs...
I will let you know if this solved the problem.