Very simply.
sudo dmidecode –type 17
This gives the following output:
# dmidecode 2.9
SMBIOS 2.4 present.
Handle 0x1100, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 2048 MB
Form Factor: DIMM
Set: None
Locator: DIMM_A
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: AD00000000000000
Serial Number: 00001016
Asset Tag: 000818
Part Number: HYMP125S64CP8-Y5
Handle 0x1101, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_B
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: AD00000000000000
Serial Number: 00003160
Asset Tag: 410801
Part Number: HYMP112S64CP6-Y5