Synology DiskStation DS620slim is a sleek, modern chassis design made for a variety of server roles such as iSCSI targets backup, file storage, email servers, and domain controllers! Celeron J3355 Dual-Core 2.0GHz CPU, Up To 2.5GHz Burst; 6GB DDR3L non-ECC SODIMM Memory; 24TB (6 x 4TB) SATA 2.5' Solid State Drives for Ultra-Fast Storage; 2 x RJ-45 1GbE LAN Ports (with Link Aggregation / Failover support); 2 x USB 3.2 Ports; Btrf File System for Advanced LUN iSCSI Service Operating System: Synology DSM Software Synology NAS chassis comes in a sealed box. Hard drives and memory upgrades included separately, NOT installed, installation required.