Synology DiskStation DS1517+2GB 5-Bay 3.5" Diskless 4xGbE NAS (Tower) Scalable, 3 Year Warranty

Synology DiskStation DS1517+ features a quad-core processor with AES-NI hardware encryption engine, providing outstanding performance even with encryption. Supercharge your storage with the optional M.2 SSD adapter card for dual SSD cache drives. DS1517+ is the ideal storage solution for centralizing data backups, protecting critical assets, and sharing files across different platforms. Synology DS1517+ is backed with Synology's 3-year limited warranty.Extended Warranty - Extend warranty from 3 years to 5 Years with the additional purchase of EW201 ( Extended Warranty license must be registered at the same time as the NAS)

Quad-core 5-bay NAS with AES-NI support, with over 1,165 MB/s reading and 527 MB/s writing performance
PCIe slot for optional 10GbE add-on card. Four 1GbE (RJ-45) ports with failover and Link Aggregation support
Optional M2D17 adapter card for dual M.2 SATA SSDs for cache3
Memory configurations: 2GB with easily upgradable dual channel design, up to 16GB (RAM modules must be same size) 2 RAM Slots available.
Advanced Btrfs file system offering 65,000 system-wide snapshots and 1,024 snapshots per shared folder
Scale up to 15 drives with two DX517 expansion units
Maximum IP camera: 40 (total of 1,200 FPS at 720p, H.264) (Includes two free camera licenses; additional cameras require the purchasing of additional licenses)
Optional RAM - 16 GB (8 GB x 2) DDR3 ECC SO-DIMM kit (RAM1600DDR3L-8GBx2), 8 GB (4 GB x 2) DDR3 ECC SO-DIMM kit (RAM1600DDR3L-4GBx2),
Optional Accessories - Synology E10G17-F2 / E10G15-F1 10Gbps Ethernet adapters, Synology M2D17 M.2 SSD adapter card , Synology Expansion Unit DX517 , Synology VS360HD
Surveillance Device License Packs
Wake on LAN/WAN - Yes
PCIe 2.0 slot - 1 x 4-lane x8 slot / 10GbE network interface cards support / M.2 SATA SSD adapter card support
NOTE - only 1 PCIe slot !!!