MCX623105AN-VDAT: NVIDIA ConnectX-6 Dx EN Dual-Port 25GbE SFP56 PCIe 4.0 x16 Ethernet Network Adapter
Also listed as: ConnectX-6 Dx 25GbE, MCX623105AN-VDAT-SP, MCX623105AN, MCX623105AC-VDAT · made by Mellanox
The NVIDIA ConnectX-6 Dx EN dual-port 25GbE SFP56 adapter provides next-generation PCIe 4.0 networking combined with hardware root-of-trust, connection tracking offload, and inline MACsec encryption. Engineered for mission-critical enterprise private clouds and Zero Trust architectures, it delivers wire-speed RoCEv2 acceleration with unprecedented low latency. Second-hand market purchasers should verify firmware certificate chains, inspect contact fingers for scoring, and ensure half-height brackets fit target server nodes.
Specifications
| Part number | MCX623105AN-VDAT |
|---|---|
| Brand | NVIDIA |
| Made by | Mellanox |
| Type | Network adapters |
| Other numbers | ConnectX-6 Dx 25GbE, MCX623105AN-VDAT-SP, MCX623105AN, MCX623105AC-VDAT |
| Status | current |
| Interface | PCIe 4.0 x16 |
| Form factor | PCIe Low Profile |
| Ports | 2x 25GbE SFP56 |
| Speed | 25GbE |
| Generation fit | PCIe Gen4 enterprise servers |
About the MCX623105AN-VDAT
MCX623105AN-VDAT is NVIDIA's ConnectX-6 Dx EN dual-port 25GbE SFP56 PCIe 4.0 x16 network adapter. Providing wire-speed 25GbE connectivity with hardware root-of-trust, inline MACsec encryption, and connection tracking offload, it is designed for Zero Trust enterprise private clouds, telco edges, and secure Kubernetes clusters requiring low-latency RoCEv2.
Compatibility
Installs into standard PCIe 4.0 x16 slots and is backward compatible with PCIe 3.0 slots. Features two SFP56 cages supporting 25GbE, 10GbE, and 1GbE optical transceivers and direct attach copper cables. Supported across Linux, VMware ESXi, and Windows Server via native mlx5 drivers.
How to identify a genuine unit
The board carries an official NVIDIA label displaying model MCX623105AN-VDAT and ConnectX-6 Dx 25G notation. In Linux, lspci detects ConnectX-6 Dx network controller with device ID 101D. The card accepts standard NVIDIA firmware updates through mstflint.
Buying used
Inspect the dual SFP56 optical cages for bent pins and verify that link establishes cleanly at 25Gbps or 50Gbps. Check that the gold PCIe edge contacts are pristine. Verify that the card includes the appropriate bracket height for your target server chassis.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 420 (1 sighting, Oct 2026)
Used: USD 260 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 420 | 2026-10-27 | |
| ebay.com | used | USD 260 | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
Equivalent part numbers
- Dell 540-BDCQ Dell Mellanox ConnectX-6 Dx Dual Port 25GbE SFP56 PCIe Adapter
FAQ
What port type is used on MCX623105AN-VDAT?
Two SFP56 ports supporting 25GbE, 10GbE, and 1GbE speeds.
What is the host interface?
PCI Express 4.0 x16.
Buying or selling MCX623105AN-VDAT?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- NVIDIA ConnectX-6 Dx Ethernet Adapter Cards User Manual, checked 2026-10-27