A-Tech Server 32GB Kit (2x16GB) DDR4 2133MHz PC4-17000 ECC UDIMM 2Rx8 Dual Rank 1.2V ECC Unbuffered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series)

$395.98

Amazon.com

OWC 16GB DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered SODIMM 1.2V 260-pin Memory RAM Compatible with Synology D4ECSO-2666-16G, D4ES01-16G

$159.99

Amazon.com

A-Tech Server 16GB Kit (2 x 8GB) 2Rx8 PC3L-12800E DDR3 1600MHz ECC Unbuffered UDIMM 240-Pin Dual Rank DIMM 1.35V Workstation Server Memory RAM Upgrade Stick Modules (A-Tech Enterprise Series)

$85.72

Amazon.com

OWC 32GB (2x16GB) DDR4 3200MHz PC4-25600 CL22 1RX8 ECC Unbuffered UDIMM 1.2V 288-pin Workstation Server Memory RAM

$318.38

Amazon.com

OWC 512GB (8x64GB) DDR4 3200MHz PC4-25600 CL22 2RX4 ECC Registered RDIMM 1.2V 288-pin Memory RAM Upgrade for Server

$4,298.32

Amazon.com

OWC 64GB (2x32GB) DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered SODIMM 1.2V 260-pin Memory RAM

$646.73

Amazon.com

OWC 16GB DDR4 RAM Compatible with Synology DiskStation DS723+ and DS923+ NAS System 2666MHz PC4-21300 CL19 ECC Unbuffered SODIMM 2Rx8 1.2V Memory Upgrade

$159.99

Amazon.com

NEMIX RAM 32GB (2X16GB) DDR4 3200MHz PC4-25600 2Rx8 1.2V CL22 288-PIN ECC Unbuffered UDIMM KIT

$339.49

Amazon.com

OWC 16GB DDR4 2666MHz PC4-21300 CL19 2RX8 ECC Unbuffered UDIMM 1.2V 288-pin Workstation Server Memory RAM

$159.99

Amazon.com