Below are few examples on how to retrieve a hardware information about RAM on Linux system.
Number of RAM slots
Number of RAM slots available on the motherboard:
# dmidecode -t 17 | grep ^H | wc -l OR # dmidecode -t 16 | grep Number
RAM module speed
# dmidecode -t 17 | grep Speed | uniq
RAM module Manufacturer
# dmidecode -t 17 | grep Manu | uniq
RAM module Model
# dmidecode -t 17 | grep Part | uniq
Maximum Capacity per array
# dmidecode -t 16 | grep Max
RAM type
# dmidecode -t 17 | grep Type: | uniq
Installed vs empty RAM slots
# dmidecode -t 17 | grep Size OR # inxi -m
Memory Module Voltage
# dmidecode -t 5 | grep Volt