Você pode obter tudo o que deseja com este comando:
sudo dmidecode --type memory
1ª parte da informação que você recebe:
SMBIOS 2.7 present.
Handle 0x001B, 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: No Error
Number Of Devices: 2
Handle 0x001C, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x001B
Error Information Handle: 0x001E
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: ELPIDA
Serial Number: 5A0C95A6
Asset Tag: 0123456789
Part Number: EBJ41UF8BAS0-DJ-F
Rank: Unknown
Configured Clock Speed: 1333 MHz