Synology M2D20 M.2 SSD Adapter Card Designed to supercharge your NAS I/O performance without sacrificing 2 bays for normal volume. • PCIe 3.0 x8 adapter card for Dual M.2 SSD slot • Support form factor: 2280/22110 • Supports M.2 NVMe or SATA SSD Supported models (M.2 NVMe SSD ONLY) SA series: SA3600, SA3400 22 series: DS3622xs+, DS2422+ 21 series: RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+ 20 series: RS820RP+, RS820+ 19 series: DS2419+, DS2419+II, DS1819+ 18 series: RS3618xs, RS2818RP+, RS2418RP+, RS2418+, DS3018xs, DS1618+ 17 series: RS18017xs+, RS4017xs+, RS3617xs+, RS3617RPxs, DS3617xs *DSM version requirement: 6.2.3-25426 or later version *DSM version requirement for RS18017xs+, RS4017xs+, RS3618xs, RS3617xs+, RS3617RPxs, DS3617xs: 7.0.1 or later version