https://kb.synology.com/en-id/DSM/tutorial/Which_Synology_NAS_models_support_SSD_cache
Synology NAS models with internal M.2 slots or that officially support M.2 PCIe cards
- DS3622xs+
- DS3617xsII
- DS3617xs
- DS3018xs
- DS2422+
- DS2419+II
- DS2419+
- DS1823xs+
- DS1821+
- DS1819+
- DS1817+
- DS1621xs+
- DS1621+
- DS1618+
- DS1522+
- DS1520+
- DS1517+
- DS1019+
- DS923+
- DS920+
- DS918+
- DS723+
- DS720+
- DS423+
- DS420+
- RS18017xs+
- RS4021xs+
- RS4017xs+
- RS3621xs+
- RS3621RPxs
- RS3618xs
- RS3617xs+
- RS3617RPxs
- RS2821RP+
- RS2818RP+
- RS2423RP+
- RS2423+
- RS2421RP+
- RS2421+
- RS2418RP+
- RS2418+
- RS1619xs+
- RS1221RP+
- RS1221+
- RS1219+
- RS822RP+
- RS822+
- RS820RP+
- RS820+
- RS818RP+
- RS818+
- FS2017
- FS1018
- SA6400
- SA3600
- SA3400