QNAP TS-451S 4-Bay Slim NAS, Intel 2.41GHz Dual Core CPU with Media Transcoding, 2.5" SATA 6Gb/s (TS-451S-US) Transcode Full HD videos on-the-fly or offline Play 1080p videos with 7.1 channel surround sound pass-through via HDMI output Create a personal cloud and stream your multimedia library via DLNA, AirPlay, and Plex Centralize your file storage, sharing and backup Run a virtual machine and extend the functionality of the NAS with an integrated virtualization solution Expand the total raw storage capacity up to 52TB (with maximum 12 hard drives) with the economical QNAP expansion enclosure UX-800P Intel Celeron Dual Core 2.41GHz, 1GB (Max 8GB) DDR3L RAM, SATA 6Gbps, USB 3.0, 2 LAN. Powerful on-the-fly and offline transcoding, HDMI out with XBMC, Virtualization Station with 1 VM support (RAM of NAS &gt;= 2GB), Surveillance Station (Max 24 Ch), max 1 UX