10 GbE-SFP+ expansion card with two ports for Synology server Port: PCIe 3.0 x8 Boost network bandwidth and performance with the Synology E10G21-F2 network card with two 10 GbE-SFP+ ports. Tackle more processes, users and HD videos with ease. Compatibility: FS series: FS6400, FS3600, FS3400, FS3017, FS2017, FS1018 SA series: SA3600, SA3400, SA3200D UC series: UC3200 21 series: RS4021xs+, RS3621xs+, RS3621RPxs, RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+ Series 20:RS820RP+, RS820+ 19 series: RS1619xs+, DS2419+, DS1819+ 18 series: RS3618xs, RS2818RP+, RS2418RP+, RS2418+, DS3018xs, DS1618+ 17 series: RS18017xs+, RS4017xs+, RS3617xs+, RS3617RPxs, DS3617xs