MT18JSF51272AZ-1G1D1 vs MT18JSF51272AZ-1G4D1 vs MT18JSF51272AZ-1G4K1

PartNumber	MT18JSF51272AZ-1G1D1	MT18JSF51272AZ-1G4D1	MT18JSF51272AZ-1G4K1
Description	MODULE DDR3 SDRAM 4GB 240UDIMM	MODULE DDR3 SDRAM 4GB 240UDIMM	MODULE DDR3 SDRAM 4GB 240UDIMM