RAM & Memory Upgrades
Timetec DDR4-2666 32GB KIT(2x16GB) Replacement for Synology D4ECSO-2666-16G DDR4 ECC Unbuffered SODIMM 2666MHz PC4-21300 260 Pin 1.2V CL19 Dual Rank 2Rx8 Memory RAM Upgrade (D4ECSO-2666-16G_TT)
Replacement for Synology D4ECSO-2666-16G DDR4 ECC Unbuffered SODIMM RAM (DDR4 2666MHz PC4-21300 260 Pin Unbuffered ECC 1.2V CL19 Dual Rank 2Rx8 based 1024x8)
https://www.bizrate.co.uk/ram_memoryupgrades/timetec-ddr4-2666-32gb-kit-2x16gb-replacement-oid36025650902.html