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I'ts an original Synology memory RAM module DDR4 SODIMM. This D4NESO 2666 4G can be used to expand the RAM memory of Synology NAS. Compatible with the following models:RS820RP+, RS820+, DS2419+, DS1819+, DS1618+, DS920+, DS720+, DS420+, DVA3219Memory Type: DDR4 non-ECC unbuffered SODIMM..