A-Tech 64GB ECC Registered Memory Kit for HP Z420 Workstation (4 x 16GB) ECC-RDIMMDDR3 PC3-12800 1600MHz 240-Pin DIMM 2Rx4 1.5V Dual Rank RAM Upgrade

64GB (4x16GB) DDR3 PC3-12800 ECC REGISTERED 2Rx4 1.5V (240-Pin DIMM 1600MHz) Memory RAM Upgrade Kit Genuine A-Tech Brand Lifetime Warranty + Free United States Based Technical Support! Designed for HP Z420 Workstation with a 600W PSU or larger only* (400W PSU has a max memory capacity of 16GB ECC RDIMM) Please verify the ECC memory technology and speed support capabilities of your installed CPU prior to purchase These modules are ECC Registered and will NOT operate with memory modules of another ECC Type!