4PCS 4GB 4GB PC3-12800 CL11 256x4 Registered ECC DDR3-1600 240pin DIMM. MANUFACTURED BY Computer Memory Solutions GUARANTEED TO WORK IN YORU SYSTEM OR YOU GET ALL OF YOUR MONEY BACK Lifetime warranty We only use Major brands, we dont use OEM or Generic Compatible with
HP/Compaq Workstation Z620 Maximum Memory: 96GB ECC UDIMM 192GB
RDIMM Expansions: 12 Socket (s) This system supports either Registered ECC or Unbuffered ECC memory. Mixing RDIMM and UDIMM modules is not supported within this system. 1066MHz, 1333MHz, 1600MHz and 1866MHz memory speeds depending on processor model. 1866MHz memory requires E5-2600 v2 or E5-1600 v2 series processors. Kingston recommends installing like modules in banks of four for quad channel performance.