64GB (2X32GB) SERVER RAM MODULE KIT DDR4 2666MHZ PC4-21300 REGISTERED ECC RANK2 1.2V 2GX8 CL19 INTEGRAL
CMS 48GB (6X8GB) DDR3 10600 1333MHZ ECC Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z600 C2 Seires Only Ddr3 Ecc Reg for Server Only - C75 at Amazon.com