CMS 16GB (4X4GB) DDR3 12800 1600MHz ECC Registered DIMM Memory Ram Compatible with HP/Compaq Workstation Z620 Ddr3 Ecc Reg for Server Only at Amazon.com
Kingston Technology 16GB Kit (4x4 GB) 1600MHz DDR3 PC3 12800 240-Pin ECC DIMM Memory for HP/Compaq KTH-PL316EK4/16G at Amazon.com