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QNAP QXG-25G2SF-CX6 Dual-Port 25GbE SFP28 Network Card, NVIDIA Mellanox ConnectX-6 Lx, PCIe Gen4 x8

Price:

$ 779.79


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QNAP QXG-25G2SF-CX6 Dual-Port 25GbE SFP28 Network Card, NVIDIA Mellanox ConnectX-6 Lx, PCIe Gen4 x8

https://arcip.com.au/web/image/product.template/8276/image_1920?unique=874d354

QNAP QXG-25G2SF-CX6 dual-port 25GbE SFP28 network expansion card with NVIDIA Mellanox ConnectX-6 Lx controller and PCIe Gen4 x8 interface. Supports 25Gbps/10Gbps, SR-IOV (up to 127 VFs per port), RoCE, Zero Touch RoCE, iSER, NFS over RDMA (QTS 5.2.6 / QuTS hero h5.2.6 or later), VXLAN/NVGRE/Geneve and three FEC modes. Works in QNAP NAS (QTS / QuTS hero), Windows 8/10, Windows Server 2016/2019 and Ubuntu 20.04/22.04. Low-profile with full-height bracket included. 3 years QNAP warranty. Genuine QNAP from ARC IP Networks, authorised QNAP reseller with Australian stock.

$ 779.79 779.79 AUD $ 779.79 incl. GST

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QXG-25G2SF-CX6
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4713213519066

QNAP QXG-25G2SF-CX6 at a glance

The QNAP QXG-25G2SF-CX6 is a dual-port 25GbE SFP28 network expansion card built on the NVIDIA Mellanox ConnectX-6 Lx controller with a PCIe Gen4 x8 interface. It supports SR-IOV, RoCE, iSER and NFS over RDMA (QTS 5.2.6 / QuTS hero h5.2.6 or later), and works in QNAP NAS, Windows and Linux.

ARC IP Networks is an authorised QNAP reseller in Australia. We supply the genuine QNAP QXG-25G2SF-CX6 from Australian stock, with a GST tax invoice on every order.

Ports2 x 25GbE SFP28
ControllerMellanox ConnectX-6 Lx
InterfacePCIe Gen4 x8
AccelerationSR-IOV, RoCE, RDMA

Best for

  • Adding 25GbE to QNAP all-flash NAS
  • VMware virtualisation that benefits from SR-IOV and RoCE
  • Video post-production, AI training and HPC workloads using NFS over RDMA

Key features

Two SFP28 ports supporting 25Gbps and 10Gbps.

NVIDIA Mellanox ConnectX-6 Lx controller on a PCIe Gen4 x8 interface.

SR-IOV with up to 127 virtual functions per port and 8 physical functions per host.

RoCE and Zero Touch RoCE reduce latency for VMware virtualisation environments.

NFS over RDMA with QTS 5.2.6 or QuTS hero h5.2.6 or later, falling back to TCP/IP if the client lacks RoCE.

iSER, VLAN insertion/stripping and NVGRE, VXLAN and Geneve support.

Three FEC modes (No FEC, BASE-R FEC and RS-FEC) for reliable links.

QNAP-listed cables: CAB-DAC15M-SFP28, CAB-DAC30M-SFP28 and TRX-25GSFP28-SR transceiver.

QNAP QXG-25G2SF-CX6 specifications

QNAP QXG-25G2SF-CX6 technical specifications
SpecificationValue
Network
ControllerNVIDIA Mellanox ConnectX-6 Lx
Number of ports2 x SFP28
Transmission rates25Gbps/10Gbps
Port and cableSFP28 DAC cable or SFP28 optical transceiver
QNAP cablesCAB-DAC30M-SFP28, CAB-DAC15M-SFP28, TRX-25GSFP28-SR
IEEE standards802.3ae, 802.3by (all FEC modes), 25/50 Ethernet Consortium 25G and 50G, 802.3ad/802.1AX, 802.3az (Fast-Wake only), 802.3ap, 802.1Q/802.1P, 802.1Qaz (ETS)
Advanced features
SR-IOVYes, up to 127 virtual functions per port
Physical functions per host8
RoCE / Zero Touch RoCEYes
iSERYes
VLAN insertion/strippingYes
NVGRE, VXLAN, GeneveYes
Interface and physical
PCIePCIe Gen4 x8
Dimensions117.33 mm length, 1-slot width, low-profile (PCBA, excluding bracket)
BracketLow-profile pre-installed; full-height and specialised brackets bundled
Compatibility
QNAP NASModels with PCIe slot(s), 1 free slot required
NAS operating systemQTS / QuTS hero (latest version recommended)
WindowsWindows 8/10, Windows Server 2016/2019
LinuxUbuntu 20.04 and 22.04 (mlx5_core driver)
Package and warranty
Package contents1 x network card, 1 x QIG, 3 x brackets
Standard warranty3 years

Figures from QNAP's official product page and hardware specifications.

The QNAP QXG-25G2SF-CX6 in depth

25GbE for all-flash NAS

QNAP all-flash NAS models support 25GbE, and the QXG-25G2SF-CX6 adds two SFP28 ports to expand connectivity or connect to a 25GbE switch.

SR-IOV, RoCE and NFS over RDMA

SR-IOV gives VMs direct access to network resources with lower CPU overhead, and RoCE reduces latency for VMware environments. Building on RoCE, NFS over RDMA lets clients access data in NAS memory directly, cutting I/O latency and CPU use for video post-production, AI training and HPC.

Reliable links with FEC

Choose No FEC for the lowest latency, BASE-R FEC (around 80ns) or RS-FEC (around 260ns) for longer links. Both ends must use the same mode.

Frequently asked questions

Straight answers about the QNAP QXG-25G2SF-CX6 from the ARC IP Networks team. Last reviewed October 2026.

It has two SFP28 ports supporting 25Gbps and 10Gbps, using SFP28 DAC cables or SFP28 optical transceivers.

Yes, with QTS 5.2.6 or QuTS hero h5.2.6 or later. Both the NAS and client devices must support RoCE; otherwise the connection falls back to standard TCP/IP.

A PCIe Gen4 x8 slot. It is low-profile with full-height and specialised brackets included.

QNAP lists the CAB-DAC15M-SFP28 and CAB-DAC30M-SFP28 DAC cables and the TRX-25GSFP28-SR optical transceiver.

QNAP lists a 3 years standard warranty.

ARC IP Networks is an authorised QNAP reseller and supplies the QXG-25G2SF-CX6 from Australian stock with a GST tax invoice.

Explore the full QNAP range: Shop all QNAP

Buy the QNAP QXG-25G2SF-CX6 in Australia

ARC IP Networks is an authorised QNAP reseller, supplying QNAP NAS, expansion units, switches and network cards to businesses, creative studios, integrators and home users across Australia.

  • Genuine QNAP: sourced through QNAP's authorised Australian distribution, never grey import.
  • Australian stock, shipped Australia-wide.
  • Manufacturer's warranty and local pre-sales help choosing the right model.
  • GST tax invoice on every order, with trade and project pricing available.

Planning QNAP storage?

Ask ARC IP Networks for project pricing or a configured quote, or call us to check the right QNAP model for your data.

Brand QNAP

Accurate Shipping Costs

Our online shipping calculator is designed to provide a final, accurate shipping cost based on the items in your cart and your delivery postcode. Shipping costs are calculated at checkout based on your order and delivery postcode. The final cost is calculated based on several factors which are automatically accounted for by our system, including:

  • The stock location of the item(s) across our warehouses.
  • Orders with multiple items that may require special packaging.
  • The weight and dimensions of the order (including heavy or oversized items).
  • The delivery courier servicing your specific region.

Delivery Times


 

Standard Processing


Most orders placed by 2pm AEDT are dispatched for next working day delivery. Larger orders may require 1-2 additional business days for processing. If timing is critical, please contact us to discuss expedited options (additional charges may apply).


Delivery Timeframes


Region

Processing Time

Express Delivery

Standard Delivery

VIC, NSW, SA, QLD Metro, TAS

1-2 business days

1-2 business days

2-4 business days

NT, WA, QLD Rural

1-2 business days

1-2 business days

3-5 business days

New Zealand

1-2 business days

2-3 business days

4-10 business days

Please note: Processing times may extend during peak periods such as Christmas and end of financial year.

Free Warehouse Pickup



Save on shipping costs with free pickup from our ARC IP Networks Blackburn warehouse. Simply place your order online or by phone, and collect during business hours (Monday to Friday). Please allow time for picking and packing. For urgent orders, call 1300 100 440 to confirm your order is ready.

ARC IP Networks Pickup Address: 6 George Street, Blackburn, VIC 3130


Insurance & Tracking



All ARC IP Networks shipments are fully insured and trackable. Once dispatched, you'll receive an email with your tracking number and courier website details. If your item is confirmed lost or damaged by our courier, we'll arrange a replacement in consultation with you.


International Shipping



ARC IP Networks ships to New Zealand. Please note:


  • Import duties and taxes vary by country
  • Buyers are responsible for all customs charges
  • Contact your local customs authority before ordering
  • We'll provide required documentation for smooth customs clearance
  • Buyers cover all shipping costs for returns due to refused duties/taxes


Delivery Requirements


Signature Required


All deliveries must be signed for. If you won't be home, contact our Sales Support team to arrange Authority to Leave. Important: Authority to Leave voids shipping insurance if parcels are lost or stolen.


Delivery Restrictions


We do not deliver to PO Boxes or Parcel Lockers as our couriers cannot access them. Orders sent to these addresses will be returned, incurring redelivery fees.


Shipping Issue Resolution


ARC IP Networks works closely with our shipping partners to resolve any delivery issues quickly and fairly:


  1. Confirmation: We verify expected delivery dates with our shipping partners
  2. Investigation: Issues outside normal timeframes trigger formal investigations
  3. Communication: We keep you updated throughout the resolution process
  4. Resolution: Confirmed lost items are replaced or refunded after investigation completion


Please note: Refunds for lost, missing, or delayed orders cannot be processed until shipping partner investigations are complete. This does not affect your rights under the Australian Consumer Law, and refunds or replacements will be provided where required once loss or damage is confirmed.

Warranty & Faulty Products

ARC IP Networks complies with the Australian Consumer Law (ACL).

If a product is faulty, damaged, not of acceptable quality, or does not perform as advertised, you are entitled to a repair, replacement, or refund in accordance with ACL.

Manufacturer Warranty Returns

For faults developing after 14 days within the warranty period:

  • Contact ARC IP Networks first at info@arcip.com.au or 1300 100 440
  • We will assess the issue and coordinate with manufacturers, authorised service centres, or distributors on your behalf
  • Where required, a manufacturer RMA may be arranged
  • ARC IP Networks manages the return process and next steps

Dead on Arrival (DOA)

Products that arrive faulty or damaged must be reported within 14 days of delivery.

ARC IP Networks will arrange assessment, replacement, or refund as appropriate.

Change of Mind & Non-Faulty Returns

Change-of-mind returns must be requested within 14 days of delivery. For change-of-mind returns, the product must be unused, unopened, in its original packaging, and returned with all accessories and documentation. These conditions apply only to change-of-mind returns and do not limit or exclude your rights under the Australian Consumer Law. Some products are not eligible for change-of-mind returns, including:

  • Ex-demo products
  • Clearance or markdown items
  • Special-order items
  • Products clearly marked “No Change-of-Mind Returns”

Important

This does not affect your rights under Australian Consumer Law.

If a product is faulty, not of acceptable quality, or does not meet advertised specifications, it remains eligible for return regardless of category.

Refunds & Processing Timeframes

  • Approved refunds are processed within 7 business days of receiving returned goods
  • Refunds are issued to the original payment method, unless otherwise agreed
  • Replacement or repair may be offered where appropriate
  • Store credit may be offered only with customer consent

Handling fees and non-returnable service charges may not be refundable where permitted by law.


Restocking Fees

For approved change-of-mind or non-faulty returns, a 15% restocking fee applies.

  • Any applicable restocking fee will be clearly communicated prior to return approval
  • The fee will be deducted from the refund amount
  • Restocking fees do not apply to returns made under the Australian Consumer Law, including faulty, damaged, or misrepresented goods.

Return Shipping Costs

  • Change-of-mind returns: The customer is responsible for return shipping costs.
  • Faulty or defective products: ARC IP Networks covers return shipping under Australian Consumer Law.

Non-Warranty Repairs

For issues not covered by warranty:

  • ARC IP Networks will provide a quote before proceeding
  • Customers are responsible for all shipping and service costs
  • No repairs are undertaken without customer approval

Return Methods

Returns may be made:

  • In-store at ARC IP Networks – 6 George Street, Blackburn VIC 3130
  • Or by shipment as instructed by our support team

Proof of purchase is required for all returns.

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