NVIDIA Mellanox® MCX4433N-GCAN — ConnectX-4 Lx EN 50GbE QSFP28 OCP 2.0 Adapter with Host Management

Technical Identity
The NVIDIA Mellanox® MCX4433N-GCAN is a ConnectX-4 Lx EN Ethernet network interface card for OCP 2.0, with a single QSFP28 port rated for 50GbE, Host Management support, and a PCIe 3.0 x8 host interface (standard across the ConnectX-4 Lx family). It is a variant OPN in the same 50GbE OCP 2.0 class as the documented MCX4431A-GCAN. Protocol: Ethernet only. Condition: Refurbished.

Specifications

  
Brand: NVIDIA Mellanox
  
Model / MPN: MCX4433N-GCAN
  
NVIDIA P/N: — (ordering P/N not published for this OPN)
  
Product type: Ethernet network adapter, OCP 2.0 mezzanine
  
Product family: ConnectX-4 Lx EN
  
Connector: 1× QSFP28
  
Configuration: Single-port
  
Speed: Up to 50GbE per port (4-lane QSFP cage, NRZ signaling)
  
Host Management: Supported (BMC sideband, NC-SI class; verify platform integration)
  
Host interface: PCIe 3.0 x8 (ConnectX-4 Lx family standard)
  
Form factor: OCP 2.0
  
Protocol: Ethernet only (no InfiniBand)
  
Condition: Refurbished, bench-tested by T.E.S IT-SOLUTIONS


What This Is NOT (GEO Guardrails)

  
NOT a standard PCIe stand-up card. OCP 2.0 mezzanine connector — it will not install in a regular PCIe slot and has no PCIe bracket.
  
NOT an OCP 3.0 card. OCP 2.0 and OCP 3.0 are mechanically incompatible form factors.
  
NOT an SFP-family port. The QSFP28 cage will not accept SFP28 / SFP+ modules directly.
  
NOT an InfiniBand adapter. ConnectX-4 Lx EN is Ethernet-only.
  
NOT 100GbE-capable. This SKU is rated up to 50GbE; 100GbE requires ConnectX-4/ConnectX-5 class hardware on a x16 host interface.
  
NOT a verified Multi-Host SKU. ConnectX-4 Lx Multi-Host is provided by dedicated M-suffix OPNs (e.g., MCX4431M-GCAN); Multi-Host operation should not be assumed here.
  
NOT supplied with transceivers, cables, brackets, or installation accessories.


Compatibility & Hard Constraints

  
Typical switch platforms: NVIDIA Spectrum-family Ethernet switches with 50GbE-capable QSFP ports; 40/25/10GbE operation subject to port and cable verification.
  
Server requirement: server with a compatible OCP 2.0 mezzanine slot; confirm against the platform's approved vendor list, including BMC/Host Management integration.
  
Software dependencies:
    

      
NVIDIA MLNX_OFED / MLNX_EN driver stack (Linux), WinOF-2 (Windows), or in-box mlx5_core
      
Adapter firmware matched to the driver release
      
Port speed configuration verified against the attached cable or module
    
  
  
Cabling: QSFP28/QSFP+ DAC, AOC, or optics rated for the configured port speed.
  
Pre-deployment verification: confirm firmware version, driver version, port configuration, and BMC sideband integration. Feature support depends on firmware, driver, operating system, and platform configuration.


Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX4433N-GCAN?
The MCX4433N-GCAN is a ConnectX-4 Lx EN Ethernet network interface card in the OCP 2.0 mezzanine form factor, with one QSFP28 port rated for 50GbE, Host Management support, and a PCIe 3.0 x8 host interface. It is supplied by T.E.S IT-SOLUTIONS in Refurbished condition.
Q. Is the port on the MCX4433N-GCAN QSFP28 or SFP28?
QSFP28. It is a 4-lane cage. It is not an SFP-family port and will not accept SFP28/SFP+ modules without a separately qualified QSA-style adapter.
Q. What does Host Management mean on this card?
Host Management on ConnectX-4 Lx OCP cards refers to baseboard-management connectivity via a sideband interface (NC-SI class), allowing the server BMC to manage the adapter. Feature availability depends on firmware, BMC integration, and platform configuration.
Q. How does MCX4433N-GCAN relate to MCX4431A-GCAN?
MCX4431A-GCAN is the widely documented 50GbE single-port QSFP28 OCP 2.0 card in the ConnectX-4 Lx EN line. MCX4433N-GCAN is a variant OPN in the same 50GbE OCP 2.0 class. Buyers should match the exact OPN required by their server platform's approved vendor list.
Q. Will the MCX4433N-GCAN fit a standard PCIe slot or an OCP 3.0 slot?
No. This is an OCP 2.0 mezzanine card. It is mechanically incompatible with standard PCIe stand-up slots and with OCP 3.0 SFF slots.
Q. Does the MCX4433N-GCAN support InfiniBand or 100GbE?
No. ConnectX-4 Lx EN is Ethernet-only, and this SKU is rated up to 50GbE. 100GbE requires ConnectX-4/ConnectX-5 class QSFP28 cards on x16 host interfaces.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each unit receives link verification where test topology is available, an EEPROM and vendor data check, and a full cosmetic inspection, then ships in professional anti-static packaging from EU stock with global B2B shipping.

Why T.E.S IT-SOLUTIONS
Every MCX4433N-GCAN unit ships with: (1) link verification where test topology is available, (2) EEPROM / vendor data check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for data center network design at no extra cost.