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Sealed Synology M2D18 in the original retail box, still in factory shrink wrap.What it is - PCIe 2.0 x8 adapter card with two M.2 slots
- Takes NVMe or SATA M.2 SSDs, 2280 / 2260 / 2242
- Adds SSD cache to a supported Synology NAS (storage pool on some xs models)
- Both low-profile and full-height brackets are included in the retail box
- Requires DSM 6.2-23739-2 or later
Check compatibility before you buy. Synology lists this card for these models only: - DiskStation: DS1517+, DS1618+, DS1817+, DS1819+, DS2419+, DS2419+II, DS3018xs, DS3617xs, DS3617xsII
- FlashStation: FS1018, FS2017
- RackStation: RS818+, RS818RP+, RS1219+, RS2418+, RS2418RP+, RS2818RP+, RS3617xs+, RS3617RPxs, RS3618xs, RS4017xs+, RS18017xs+, and RS822+, RS822RP+, RS1221+, RS1221RP+ on DSM 7.2 or later
Newer models such as the DS923+, DS1522+ and DS1621+ are not on that list. Check Synology's product page against your NAS before buying. One thing worth knowing: the card handles its own lane splitting with an onboard PCIe switch, so it does not need motherboard bifurcation, and people do run it in regular PCs as a plain dual-M.2 card. I have not tested that myself and I am selling it as a Synology accessory. Sealed, so untested. If it arrives DOA, message me and I will make it right. 
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