32GB Memory for ASRock Server 2U4G-EPYC, 2U4G-EPYC-2T DDR4 3200MHz ECC Registered RAM (PARTS-QUICK Brand) at Amazon.com
HPE 32GB (1x32GB) Single Rank x4 DDR4-3200 CAS-22-22-22 Registered Memory Kit | HPE Store US
CMS 6GB (3x2GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z600 DDR3 ECC UNBUFF for Server Only - B75 at Amazon.com
8GB DDR4 PC4-19200 CL=17 Dual Ranked x4 based Registered ECC DDR4-2400 1.2V 2048Meg x 72 RAM
We Explain Registered and Unregistered Memory | Server Factory Explains - YouTube