I'm trying to understand the reporting from my Dashboard which shows "Useable Size" as 15.5GB and I have 2x 16GB sticks of RAM installed. It shows "Maximum Size" as 32GB, but I'm not sure if that means that it recognizes 32GB installed or if that's the maximum the motherboard could handle. To make it more confusing and concerning, is when I go to the Docker tab and look at the Advanced View, it shows a max of 15.48GB.

 

So, I don't know if Unraid recognizes the full 32GB of RAM and is allocating 16GB to Docker or if Unraid only recognizes 16GB of RAM installed.

 

Can someone help me understand?

 

Thanks,

AJ

Please post the diagnostics.

Here are the diagnostics @JorgeB!

 

xaviertower-diagnostics-20230621-1608.zip

14 hours ago, ajtatum said:

I have 2x 16GB sticks of RAM installed.

According to diags you have 2 x 8GB installed, this model:

 

https://eu.crucial.com/memory/ddr4/ct8g4sfs824a

I know it's not my thread but I'll chime in anyway.

 

At least you've got 16GB Of my 64GB of RAM I get a whopping... 1.8GB of usable RAM.

From what I read in other topics, 'half the RAM' being available can be attributed to using DELL RAID cards (e.g. the H310 I use), which can be mitigated by blocking the SMBus pins. That's something I'll try once parity sync is through.

 

However, I use 4 sticks á 16GB and I get 1/8th of a single stick available, so something very strange is going on. 4 Sticks being dead is very unlikely, but I'll test them also after parity. I've also added my diagnostics for good measure, where it mentions This.

41 --- WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 63456MB of RAM.

bentobox-diagnostics-20230622-1239.zip

 

 

Things I'll try but currently haven't:

- update Asus Prime Z390-A BIOS (it's somewhat old)

- block SMBus pins on IT'd H310

- check for bad slots / dimms

Edited June 22, 20233 yr by BentoFox

13 minutes ago, BentoFox said:

At least you've got 16GB Of my 64GB of RAM I get a whopping... 1.8GB of usable RAM.

This looks more like a BIOS/board problem, and this confirms it:

15 minutes ago, BentoFox said:

41 --- WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 63456MB of RAM.

 

if you use only two sticks of RAM how much does it detect?

I will let you know tonight when parity rebuild is finished. Thanks already for the confirmation.

BIOS Update was enough. I have 62.7 / 64 GB available now which I consider perfectly normal and similar to my previous setup. :)