A-Tech 64GB Kit (2 x 32GB) for HP Z4 G4 Workstation - DDR4 PC4-21300 2666Mhz ECC Registered RDIMM 2Rx4 - Server Memory Ram Equivalent to OEM 850881-001 840758-091 815100-B21 (AT378359SRV-X2R4) at Amazon.com
CMS 16GB (4X4GB) DDR2 3200 400MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Proliant Dl380 G4 Server Ddr2 Ecc Reg for Server Only - B48
4GB Kit 2 x 2GB Memory for HP ProLiant DL380 G4 PC2-3200R ECC Registered DDR2-400 240 pin 1.8v DIMM (PARTS-QUICK BRAND). Equivalent to HP Part Number: 343057-B21 at Amazon.com