Built with 2.5GbE connectivity, a quad-core processor, AES-NI hardware encryption engine, 4K HDMI output, and real-time transcoding, the TS-453D 4-Bay NAS Enclosure from QNAP not only provides users with a solution to upgrade to 2.5GbE environments for productive daily backup and restore tasks, but also offers gamers resources for the vast gaming collections. The TS-435D also supports PCIe expansion with a PCIe 2.0 x2 slot, which can be fitted with a 10 Gb/s USB 3.2 Gen 2 port, an M.2 SSD for SSD cache acceleration, a 5GbE port, or a 10GbE port. Built with four drive bays that are capable of natively supporting 3.5" SATA III and SATA II hard drives, as well as 2.5" SATA hard drives and SSDs, this NAS will allow you to store and share many files, as it allows 800 maximum concurrent connections.