Linux - dmidecode
dmidecode is a tool for dumping a computer’s DMI (some say SMBIOS) table contents in a human-readable format. This table contains a description of the system’s hardware components, as well as other useful pieces of information such as serial numbers and BIOS revision. If you like to see which memory banks is in use and what the ram module sizes, you simply call dmidecode with memory parameter. # dmidecode -t memory ...