parts-quick 16GB Memory for Synology DS3617xs Compatible DDR4 ECC Unbuffered SODIMM RAM (Equivalent to Synology D4ECSO-2666-16G) at Amazon.com
Amazon.com: AddOn JEDEC Standard Factory Original 16GB DDR4-2400MHz Registered ECC Single Rank x4 1.2V 288-pin CL17 RDIMM : Electronics
Kingston 16GB Memory at Amazon.com
16GB JM DDR4 3200Mhz U-DIMM 1Rx8 2Gx8 CL22 1.2V (JM3200HLE-16G) at Amazon .com
Axiom 16GB DDR4-2666 ECC RDIMM - AX42666R19B/16G at Amazon.com
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Axiom 16GB DDR4-2133 SODIMM - AX42133S15B/16G at Amazon.com
Axiom 16GB DDR4-2133 UDIMM - AX42133N15B/16G at Amazon.com