QNAP Quad-Port 2.5GbE PCIe Network Expansion Card upgrades network connection speed by installing into an available PCIe 2.0 x4 slot on your computer NAS or other compatible device. The QXG-2G4T-I225 includes four 2.5G Ethernet ports that are backward compatible with Gigabit 100 Mb/s and 10 Mb/s speeds and work with Cat 5-class cables. The adapter comes with a low-profile bracket pre-installed and includes a full-height bracket in addition to one that is specially designed for select QNAP NAS devices.