DDR3 is the newest generation of memory modules, which are characterised by higher speeds. This item Kingston Technology 8GB DDR3 1600MHz PC3-12800 ECC DIMM Memory for Select HP/Compaq Desktops KTH-P元16E/8G A-Tech 32GB ECC Registered Memory Kit for HP Z420 Workstation (4 x 8GB) ECC RDIMM DDR3 PC3-12800 1600MHz 240-Pin DIMM 2Rx4 1.