I just discovered this command which display all you system hardware details!
Especially interesting for me was to see what size memory dims where installed and which of the bays (as well as how many there are) are being used.
The base command is:
sudo lshw
This will spit out the full list of your entire system which is quite a bit.
The following command will provide all the details for just you memory
sudo lshw -class memory
By typing the following command you will see a short list of your system details which is also where you can get the list of classes to be used in the above command.
sudo lshw -short
Hope you found this as useful!