Models with PCIe slots

Synology NAS models that have PCIe slots (that support DSM 7.2.1)

DS723+		Gen3 x2 slot - E10G22-T1-Mini only
DS923+		Gen3 x2 slot - E10G22-T1-Mini only
DS1517+		Gen 2 x8 slot (x4 link)
DS1522+		Gen3 x2 slot - E10G22-T1-Mini only
DS1618+		Gen3 x8 slot (x4 link)
DS1621+		Gen3 x8 slot (x4 link)
DS1621xs+	Gen3 x8 slot (x8 link)
DS1817+		Gen 2 x8 slot (x4 link)
DS1819+		Gen3 x8 slot (x4 link)
DS1821+		Gen3 x8 slot (x4 link)
DS1823xs+	Gen3 x8 slot (x4 link)
DS2419+		Gen3 x8 slot (x4 link)
DS2419+II	Gen3 x8 slot (x4 link)
DS2422+		Gen3 x8 slot (x4 link)
DS3018xs	Gen3 x8 slot (x8 link)
DS3617xs	Gen3 x8 slot (x8 link)
DS3617xsII	Gen3 x8 slot (x8 link)
DS3622xs+	Gen3 x8 slot (x8 link)


RS422+		Gen3 x2 slot - E10G22-T1-Mini only
RS818+		Gen 2 x8 slot (x4 link)
RS818RP+	Gen 2 x8 slot (x4 link)
RS820+		Gen3 x8 slot (x4 link)
RS820RP+	Gen3 x8 slot (x4 link)
RS822+		Gen3 x8 slot (x4 link)
RS822RP+	Gen3 x8 slot (x4 link)
RS1219+		Gen 2 x8 slot (x4 link)
RS1221+		Gen3 x8 slot (x4 link)
RS1221RP+	Gen3 x8 slot (x4 link)
RS1619xs+	Gen3 x8 slot (x8 link)
RS2418+		Gen3 x8 slot (x4 link)
RS2418RP+	Gen3 x8 slot (x4 link)
RS2421+		Gen3 x8 slot (x4 link)
RS2421RP+	Gen3 x8 slot (x4 link)
RS2423+		Gen3 x8 slot (x4 link)
RS2423RP+	Gen3 x8 slot (x4 link)
RS2818RP+	Gen3 x8 slot (x4 link)
RS2821RP+	Gen3 x8 slot (x4 link)
RS3617xs+	2 x Gen3 x8 slots (x8 link)
RS3617xs	2 x Gen3 x8 slots (x8 link)
RS3617RPxs	2 x Gen3 x8 slots (x8 link)
RS3618xs	2 x Gen3 x8 slots (x8 link)
RS3621xs+	2 x Gen3 x8 slots (x8 link)
RS3621RPxs	2 x Gen3 x8 slots (x8 link)
RS4017xs+	2 x Gen3 x8 slots (x8 link)
RS4021xs+	2 x Gen3 x8 slots (x8 link)
RS18016xs+	2 x Gen3 x8 slots (x8 link)
RS18017xs+	2 x Gen3 x8 slots (x8 link)

FS1018		Gen3 x8 slot (x8 link)
FS2017		Gen3 x8 slot (x8 link)
FS2500		Gen3 x8 slot (x4 link)
FS3017		2 PCIe slots, 1 x Gen3 x16 slot (x16 link), 1 x Gen3 x8 slot (x8 link)
FS3400		Gen3 x8 slot (x8 link)
FS3410		2 x Gen3 x8 slots (x8 link)
FS3600		Gen3 x8 slot (x8 link)
FS6400		2 x Gen3 x8 slots (x8 link)

HD6500		4 PCIe slots, 2 x Gen3 x16 slot2 (x16 link), 2 x Gen3 x8 slots (x8 link)

SA3200D		Gen3 x8 slot (x8 link) (per controller)
SA3400		2 x Gen3 x8 slots (x8 link)
SA3400D		Gen3 x8 slot (x8 link) (per controller)
SA3410		2 x Gen3 x8 slots (x8 link)
SA3600		2 x Gen3 x8 slots (x8 link)
SA3610		2 x Gen3 x8 slots (x8 link)
SA6400		2 x Gen3 x8 slots (x8 link)