The TS-251B is QNAP's first entry-level dual-core NAS with a PCIe slot, allowing users to extend NAS functionality and potential applications. Powered by an Intel® Celeron® dual-core 2.0GHz processor, the TS-251B provides home and SOHO users with an excellent cross-device multimedia experience with its 4K media transcoding and streaming capabilities, 4K HDMI output, and a wide range of backup and sharing applications.