QNAP offers various cost-effective network expansion cards for businesses & organizations to upgrade the bandwidth of their QNAP NAS to accommodate intensive data transfer & virtualization applications. 25 Gb E network expansion card Using a Mellanox Connect X-4 Lx Smart NIC controller, the 25 Gb E network expansion card provides significant performance improvements for large file sharing, intensive data transfer, & optimizes VMware virtualization applications with i SER support. Controller: Mellanox Connect X-4 Lx Connector: SFP28 PCIe interface: PCIe Gen 3 x 8 Transmission rates: 25 Gbps/10 Gbps Supported operating systems: QTS; Windows (Driver required); Linux (Driver required) Supported QNAP NAS: Models with PCIe slot (s) (1 free slot required) Bracket: Low-profile bracket pre-installed; full-height & specialized (for selected QNAP NAS) brackets are bundled Port & cable: SFP28 DAC cable (3M) or SFP28 OPTIC transceiver