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
Samsung 32GB DDR4-2666 Non-ECC Memory at Retail: $168
Kingston ValueRAM 16GB RAM 2133MHz DDR4 ECC Reg CL15 DIMM DR x 4 with TS Server Memory (KVR21R15D4/16) at Amazon.com