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dmidecode --type 17
Output:
# dmidecode 2.12 SMBIOS 2.7 present. Handle 0x003B, DMI type 17, 34 bytes Memory Device Array Handle: 0x002C Error Information Handle: Not Provided Total Width: 72 bits Data Width: 64 bits Size: 32 GB Form Factor: DIMM Set: None Locator: D0 Bank Locator: /SYS/MB/P0 Type: DDR3 Type Detail: Synchronous Speed: 1066 MHz Manufacturer: Samsung Serial Number: 366112E5 Asset Tag: Part Number: M393B4G70BM0-YH9 Rank: 1 Configured Clock Speed: 1066 MHz