QNAP QXG-25G2SF-CX6 Dual-port SFP28 10/25GbE network expansion card

25Gbps/10Gbps network card for PC or NAS

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The QXG-25G2SF-CX6 features an NVIDIA Mellanox® ConnectX®-6 Lx SmartNIC controller, supports PCIe Gen4 (backwards compatible with Gen3/ Gen2) and provides up to 25 Gbps transfer speeds (supports 10/25Gbps). By using Port Trunking to combine multiple ports, up to 50GbE can be achieved for accelerating file sharing and intensive data transfer. With SR-IOV support, the QXG-25G2SF-CX6 greatly boosts network efficiency and is ideal for I/O-intensive and latency-sensitive virtualization applications and data centers.

High-speed 25GbE Networking
The TS-h3088XU-RP supports 25GbE networking, and can be used with the QXG-25G2SF-CX6 to expand network connectivity. It can also be used with a 25GbE Switch to build a budget-friendly high-speed network environment.

Strengthen Your virtualization Environment with SR-IOV and RoCE
The QXG-25G2SF-CX6 supports SR-IOV, which can allocate bandwidth resources from a physical network card directly to VMs. It ensures reliable VM applications and reduced CPU overheads. The QXG-25G2SF-CX6 also supports RoCE, which can access a network directly in RAM to effectively reduce latency and enhance performance and efficiency for VMware® virtualization environments.

1. SR-IOV is supported by specific QNAP NAS models and should work with SR-IOV compatible adapters. Click here to check supported NAS models.
2. Both the NAS that installs the QXG-25G2SF-CX6 and the receiving-end devices must support RoCE. If the receiving devices do not support RoCE, it will use TCP/IP.

Supports Windows and Linux servers/workstations
Besides QNAP devices, the QXG-25G2SF-CX6 supports many platforms, including Windows® 10, Windows Server®, and Linux® (driver required) which allows you to attain optimal business performance for a wider range of system applications and services. The higher bandwidth density with reduced links helps reduce cabling footprint and operational costs.


NVIDIA Mellanox ConnectX-6 Lx

Number of Ports

2 x SFP28



PCIe and Lanes

PCIe Gen4 x8

Transmission Rates


IEEE Standards

IEEE 802.3ae 10 Gigabit Ethernet
25/50 Ethernet Consortium 25G and 50G supporting all FEC modes
IEEE 802.3by 25G supporting all FEC modes
IEEE 802.3ad, 802.1AX Link Aggregation
IEEE 802.3az Energy Efficient Ethernet (supports only “Fast-Wake” mode)
IEEE 802.3ap based auto-negotiation and KR startup
IEEE 802.1Q, 802.1P VLAN tags and priority
IEEE 802.1Qaz (ETS)


Low-profile bracket pre-installed; full-height and specialized (for selected QNAP NAS) brackets are bundled

SR-IOV Support


RDMA over Converged Ethernet (RoCE), Zero Touch RoCE (ZTR) Support


VLAN insertion/stripping Support


iSER Support


NVGRE, VXLAN, Geneve Support


How mant virtual functions


How many physical functions per host


Supported NAS operating systems

QTS/QuTS hero (recommend an upgrade to the latest version); Windows (Driver required); Linux (Driver required)

Supported QNAP NAS

Models with PCIe slot(s) (1 free slot required)

Support Ubuntu Commercial Linux Distribution

Ubuntu 18.04/20.04

Support Windows

Windows 8/10

Port and Cable

SFP28 DAC cable (3M) or SFP28 OPTIC transceiver

Package Content

1 x Network card; 1 x QIG; 3 x Brackets