16gb ram upgrade working with CT16G4SFD824A: https://www.galaxus.ch/en/s1/product/crucial-laptop-memory-1-x-16gb-ddr4-2400-so-dimm-260-pin-memory-10090145

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I know this 8GB one does work for sure. 
[Crucial CT8G4SFS8266 (1 x 8GB, DDR4-2666, SO-DIMM 260 pin)](https://www.digitec.ch/en/s1/product/crucial-ct8g4sfs8266-1-x-8gb-ddr4-2666-so-dimm-260-pin-memory-10661573)

https://imgur.com/a/60C2Ysl

The 260 pins look the same, so it should fit into the slot internally. There is a whole reddit post on the subject!  Would be interested to hear how you get on! 
https://www.reddit.com/r/synology/comments/goidix/good_news_ds920_supports_16gb_ddr4_ram_for_20gb/

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16gb ram upgrade working with CT16G4SFD824A: https://www.galaxus.ch/en/s1/product/crucial-laptop-memory-1-x-16gb-ddr4-2400-so-dimm-260-pin-memory-10090145