Synology RackStation 4-Bay (Diskless) Network Attached Storage (NAS) with iSCSI RS815RP+, Quad Core CPU Delivers 389.03 MB/s Reading, 361.33 MB/s Writing, AES-NI Hardware Encryption Engine Delivers 388.66 MB/s Reading, 158.9 MB/s Writing, Four Gigabit LAN Ports with Failover and Link Aggregation Support, Scale up to 8 Drives with Synology RX415, Expandable RAM Module (Up to 6GB), Redundant Power Supplies Ensure Service Uptime, High Availability and SSD Read/Write Cache Support, VMware , Citrix , and Microsoft Hyper-V Certified, Running on Synology DiskStation Manager (DSM)