Synology DiskStation 5-Bay (Diskless) Network Attached Storage (NAS) DS1515+ Quad Core CPU Delivers 446.66 MB/s Reading 425.12 MB/s Writing Four Gigabit LAN Ports with Failover and Link Aggregation Support Scale up to 15 drives with Synology DX513 Expandable RAM Module (Up to 6GB) VMware Citrix Microsoft Hyper-V Certified High Availability and SSD Read/Write Cache Support Running on Synology DiskStation Manager (DSM)