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Amazon.com: HP Z420 Workstation- 4 Core E-1620 3.6Ghz up to 3.8GHz CPU- 32GB RAM- 1TB SSD + 4TB Hard Drive with 3 YR WNTY- Nvidia 4000 2GB DDRR5 Graphics Card- Windows 10 Pro - USB 3.0 : Electronics
16Gb (2X8Gb Memory RAM Compatible with Hp/Compaq Workstation Z420 For Server Only By CMS B89 - Computer Memory Solutions
8GB 2X4GB RAM Memory Compatible for Z Series Workstations Z420 Workstation MemoryMasters Memory Module 240pin PC3-12800 1600MHz DDR3 ECC UDIMM Upgrade - Walmart.com
Z420 memory config confusion - HP Support Community - 6768533