dmidecode

root@root135:~# dmidecode -t memory
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x0014, DMI type 16, 23 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: None
        Maximum Capacity: 16 GB

        Error Information Handle: Not Provided
        Number Of Devices: 2

Handle 0x0016, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x0014
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 4096 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 1
        Bank Locator: BANK 1
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1600 MT/s
        Manufacturer: Samsung        
        Serial Number: 957BC81D
        Asset Tag:                       
        Part Number: M378B5173EB0-YK0      
        Rank: 1
        Configured Memory Speed: 1600 MT/s

Handle 0x0017, DMI type 17, 34 bytes
Memory Device
        Array Handle: 0x0014
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 4096 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 2
        Bank Locator: BANK 2
        Type: DDR3
        Type Detail: Synchronous
        Speed: 1600 MT/s
        Manufacturer: Kingston       
        Serial Number: 37319077
        Asset Tag:                       
        Part Number: ACR16D3LU1KFG/4G      
        Rank: 1
        Configured Memory Speed: 1600 MT/s

root@root135:~#