demidecode

# dmidecode

can see the server chasing information such as server tag, server model, product model and more…

# dmidecode -t -17 | grep Size

to can view the RAM size that been installed and the slot not yet installed RAM.

To check the maximum RAM capacity can installed..
# dmidecode -t 16

Therefore, ignore the -t 17 or -t 16 when execute and add pipe along with keywords..

# dmidecode | grep Size
same thing can be view, just with extra information which you may not need..

# dmidecode | grep Maximum

Sometimes.. you may forget about the case sensitive letters..
Therefore add the -i to ignore the case sensitive.

# dmidecode | grep -i size
output also same as what you need.

RAM model, speed also can be retrieve…