RAM & Memory Upgrades
16 Go (1 x 16 Go) DDR4 ECC Un-buffered SO-DIMM 2666 MHz (D4ECSO-2666-16G)
Synology Ram DDR4-2666 ECC SO-DIMM 16GB Package length: 7.64" Package width: 6.46" Package height: 7.68" Synology - DDR4 - 16 GB - SO-DIMM 260-pin - 2666 MHz / PC4-21300 - 1.2 V - unbuffered - ECC - for Deep Learning NVR DVA3219 D4ECSO-2666-16G
https://www.bizrate.co.uk/ram_memoryupgrades/16-go-1-x-16-oid12869753963.html