QNAP TS-453U 4-bay 1U iSCSI NAS, Intel 2.0GHz Quad Core CPU with 4GB RAM, 2.5"/3.5" SATA 6Gb/s, Hot-swappable, Single PSU Intel Celeron Quad Core 2.0GHz, 4GB DDR3L RAM (max 8GB), SATA 6Gb/s, 4 x GbE LAN, Virtualization Station, hardware transcoding, Surveillance Station, VMware, Citrix, Microsoft Hyper-V ready, max 1 UX expansion unit Manage, share, and back up business data with Real-time Remote Replication (RTRR) ; Expand the total raw storage capacity up to 128 TB with the economical UX-1200U-RP QNAP expansion enclosure NAS and iSCSI-SAN(IP-SAN) unified storage solution for server virtualization ; Supports VMware, Citrix, and Microsoft Hyper-V and advanced virtualization features Enhanced data security with high-performance AES 256-bit encryption and anti-virus ; Use the TS-453U as a PC with exclusive QvPC Technology Run multiple Windows/Linux/Android-based virtual machines with the Virtualization Station