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dmidecode - learn about your hardware

Nice command I stumbled across, as I was trying to figure out if the 4GB memory in my new Lenovo T420S was in one or two DIMM's.

       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. Thanks to this table, you can retrieve this information without having to probe for the actual hardware.  While this is a good point in terms  of
       report speed and safeness, this also makes the presented information possibly unreliable.

       The DMI table doesn't only describe what the system is currently made of, it also can report the possible evolutions (such as the fastest supported CPU or the maximal amount of memory supported).

And there it is.. one bank @ 1333Mhz

Handle 0x0006, DMI type 17, 28 bytes
Memory Device
        Array Handle: 0x0005
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 4096 MB
        Form Factor: SODIMM
        Set: None
        Locator: ChannelA-DIMM0
        Bank Locator: BANK 0
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1333 MHz
        Manufacturer: Hynix/Hyundai
        Serial Number: 0097AD23
        Asset Tag: 9876543210
        Part Number: HMT351S6CFR8C-H9 
        Rank: Unknown