| Controller | Broadcom 57504 |
| Number of Ports | 4x SFP+ |
| Connector | SFP+ |
| PCIe and Lanes | PCIe Gen4 x8 |
| Transmission Rates | 25Gbps/10Gbps |
| IEEE Standards | IEEE 802.1Qbb IEEE 802.1Qaz IEEE 802.1Qau IEEE 802.1Qaz |
| Bracket | Low-profile bracket pre-installed; full-height and specialized (for selected QNAP NAS) brackets are bundled |
| SR-IOV Support | Yes |
| RDMA over Converged Ethernet (RoCE), Zero Touch RoCE (ZTR) Support | Yes |
| VLAN insertion/stripping Support | Yes |
| iSER Support | Yes |
| NVGRE, VXLAN, Geneve Support | Yes |
| Supported NAS operating systems | QTS 5.2.4 and later / QuTS 5.2.4 and later |
| Supported QNAP NAS | Models with PCIe slot(s) (1 free slot required) |
| Support Ubuntu Commercial Linux Distribution | Ubuntu 22.04 |
| Support Windows | Windows 10/11 |
| Support Windows Server | Windows Server 2022 |
| Port and Cable | SFP28 DAC cable (3M) or SFP28 OPTIC transceiver |
| Package Contents | 1 x Network card; 1 x QIG; 3 x Brackets |
| Standard Warranty | 3 years |
Product images are for illustrative purposes only and may differ from the actual product. Due to differences in monitors, colors of products may also appear different to those shown on the site.
Designs and specifications are subject to change without notice.
QXG-25G4SF-BCM

The QXG-25G4SF-BCM 25 GbE network expansion card features four SFP28 ports and PCIe 4.0 x8 connectivity, delivering up to 100Gbps aggregate bandwidth to eliminate performance bottlenecks. With support for advanced offload technologies including RDMA and SR-IOV, it significantly enhances network efficiency and is well-suited for I/O-intensive and latency-sensitive virtualization and data center environments. Designed as a powerful companion for all-flash storage, the QXG-25G4SF-BCM helps unleash maximum system performance to meet the ever-increasing demands of modern IT workloads.

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NAS and PC
The QXG-25G4SF-BCM can be installed in a QNAP NAS or Windows® PC.
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PCIe 4.0
PCIe Gen 4 x8 provides up to 128 Gbps transfer speeds.
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SR-IOV
Improves the network performance of virtual machines.
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RDMA (RoCE & iSER)
Reduces latency, lowers CPU utilization, and boosts overall throughput.
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High Availability (HA) Support
Enables cross-switch failover and redundancy for uninterrupted business continuity.
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Link Aggregation
Combines multiple ports for higher bandwidth, load balancing, and network resiliency.
100Gbps High-Availability Networking for Enterprises
Use the QXG-25G4SF-BCM with QNAP’s 10GbE switches to build budget-friendly high-speed network environments.
- Uninterrupted Uptime – Multi-port redundancy and link aggregation keep your services running, even if one connection goes down.
- Seamless Failover – Low-latency performance ensures rapid node switching, minimizing disruption during HA events.
- Reliable Data Flow – Advanced acceleration and error-handling features safeguard performance, keeping business-critical workloads smooth and stable.
Strengthen your virtualization environment with SR-IOV
The QXG-25G4SF-BCM supports SR-IOV, which can allocate bandwidth resources from a physical network card directly to VMs on the NAS. It ensures reliable VM applications and reduced CPU overheads.
Note: SR-IOV is supported by specific QNAP NAS models and should work with SR-IOV compatible adapters. Click here to check supported NAS models.
Compatible with NAS and PC
The QXG-25G4SF-BCM network expansion card supports QNAP NAS, Windows®, and Linux® devices, allowing you to maximize the performance potential of all your networked devices.
- NAS operating system: QTS 5.2.6 (and later), QuTS hero h5.2.6 (and later). Check compatibility list.
- Windows®: Windows: 11® 25H2, Windows Server 2022/2025 (driver required).
- Linux®:Ubuntu® 20.04 LTS (driver required).
Firmware Notice: QNAP network adapters are validated with firmware versions released or approved by QNAP. Firmware updates performed using unauthorized firmware packages or utilities are not supported by QNAP. Issues caused by unauthorized firmware modifications may not be covered under warranty or technical support.
















