QNAP QXG-25G2SF-E810 Dual-Port 25GbE SFP28 Network Expansion Card
Overview
The QXG-25G2SF-E810 is a dual-port 25GbE SFP28 network expansion card built around the Intel Ethernet Controller E810-XXVAM2, designed to push NAS and server bandwidth well past the ceiling of 10GbE infrastructure. Installed in a PCIe Gen4 x8 slot (backwards compatible with Gen3), it delivers up to 50Gbps aggregate throughput when SMB Multichannel is enabled to bond both ports — the right answer for high-density NVR recording workloads, 4K multi-stream editing over the network, or AI inference pipelines that saturate a single 10GbE link. The low-profile form factor fits both standard and compact chassis without a riser adapter.
Compatibility
Designed for the QNAP NAS and expansion enclosure lineup that provides an open PCIe Gen4 or Gen3 x8 slot — including the TVS-h series (e.g., TVS-h874, TVS-h1288X), TS-hx90FX, and TES/TDS enterprise models with available PCIe slots. The SFP28 ports accept 25GbE direct-attach copper (DAC) cables or optical transceivers; existing 10GbE SFP+ DAC cables also operate at reduced speed on most SFP28 switch ports, protecting prior cabling investment. Switch-side requires 25GbE SFP28 ports — verify your network switches support 25GbE before ordering. Not compatible with QNAP units that expose only PCIe x4 or x1 slots, or those with no user-accessible PCIe bay.
Installation Notes
The card ships in low-profile configuration. Confirm slot physical clearance inside the target NAS chassis before installation — some QNAP enclosures ship with PCIe slot covers that require a screwdriver to remove. PCIe Gen4 x8 is the native operating mode; inserting into a Gen3 x8 slot is electrically compatible but bandwidth caps at Gen3 speeds (~16 GB/s bidirectional vs. ~32 GB/s on Gen4). Driver support requires QTS 5.0 or QuTS hero h5.0 and later; confirm firmware revision on the host NAS prior to commissioning. For DAC or transceiver selection, use QNAP's compatibility list to avoid negotiation issues at link-up.
