Synology E10G20-T2 & E10M20-T1 10Gbps Dual-Port Ethernet Adapter Cards - High-Speed Network Expansion for NAS, Workstations, and Servers - Perfect for 4K Video Editing, Data Centers & Cloud Computing

What a great addition for a barely equipped DS1819+! It ramping it up to serve 10 Gbit/s networks AND provide solid 2 x 2TB SSD cache to the whole of the box. No sparing 2 slots from storage space. You simply can use all 8 slots for storage and gain speed (and security) with the SSD cache (Raid 1). Absolute recomendation!!