NVIDIA Mellanox® MCX623435AC-VDAT — ConnectX-6 Dx EN 200GbE OCP 3.0 Adapter, Crypto Enabled

Technical Identity
The NVIDIA Mellanox® MCX623435AC-VDAT is a ConnectX-6 Dx EN Ethernet adapter card in the OCP 3.0 small form factor: 200GbE over a single QSFP56 cage, PCIe 4.0 x16 host interface, with Crypto and Secure Boot enabled. NVIDIA firmware documentation classifies this OPN as: ConnectX-6 Dx EN adapter card, 200GbE, single-port QSFP56, PCIe 4.0 x16, Crypto and Secure Boot. Protocol: Ethernet only. Condition: Refurbished.

Specifications

  
Brand: NVIDIA Mellanox
  
Model / MPN: MCX623435AC-VDAT
  
NVIDIA P/N: — (ordering P/N not published for this OPN)
  
Product type: Ethernet network adapter, OCP 3.0 small form factor
  
Product family: ConnectX-6 Dx EN
  
Connector: 1× QSFP56
  
Configuration: Single-port
  
Speed: Up to 200GbE per port
  
Modulation: 4 electrical lanes × 50Gb/s PAM4 at 200GbE
  
Host interface: PCIe 4.0 x16 (PCIe 3.0 compatible at reduced aggregate bandwidth)
  
Form factor: OCP 3.0 SFF
  
Security: Crypto and Secure Boot enabled
  
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 3.0 SFF edge connector — it will not install in a regular PCIe slot.
  
NOT an OCP 2.0 mezzanine card. OCP 2.0 and OCP 3.0 are mechanically incompatible form factors.
  
NOT an SFP-family port. The QSFP56 cage does not accept SFP28 / SFP+ modules directly.
  
NOT an InfiniBand adapter. ConnectX-6 Dx EN is Ethernet-only.
  
NOT 400GbE-capable. Maximum port speed is 200GbE; 400GbE requires ConnectX-7 class hardware.
  
NOT a Multi-Host SKU. Multi-Host ConnectX-6 Dx OCP 3.0 cards carry an M designator (e.g., MCX623436MS-CDAB).
  
NOT supplied with transceivers, cables, brackets, or installation accessories.


Compatibility & Hard Constraints

  
Typical switch platforms: NVIDIA Spectrum-2 / Spectrum-3 Ethernet switches with 200GbE QSFP56 ports; 100GbE QSFP28 infrastructure at reduced speed after verification.
  
Server requirement: OCP 3.0 SFF-compliant server slot.
  
Slot requirement: PCIe 4.0 x16 for full 200GbE throughput; PCIe 3.0 hosts limit aggregate bandwidth.
  
Software dependencies:
    

      
NVIDIA MLNX_OFED / MLNX_EN driver stack (Linux), WinOF-2 (Windows), or in-box mlx5_core
      
Current adapter firmware matched to the driver release
      
Port speed / FEC configuration verified against the attached cable or transceiver
    
  
  
Cabling: QSFP56 DAC, AOC, or optical transceivers qualified for 200GbE.
  
Pre-deployment verification: confirm firmware version, driver version, and port configuration. Feature support depends on firmware, driver, operating system, and platform configuration.


Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX623435AC-VDAT?
The MCX623435AC-VDAT is a ConnectX-6 Dx EN Ethernet adapter card in the OCP 3.0 small form factor. It provides one QSFP56 port running at up to 200GbE over a PCIe 4.0 x16 host interface, with Crypto and Secure Boot enabled. It is supplied by T.E.S IT-SOLUTIONS in Refurbished condition.
Q. Is the port on the MCX623435AC-VDAT QSFP56 or QSFP28?
The cage is QSFP56. 200GbE operation uses 4 lanes of 50Gb/s PAM4 signaling. QSFP28 100GbE-class cabling is commonly used with ConnectX-6 Dx at reduced speed, but cable qualification and port speed configuration must be verified before deployment.
Q. Will the MCX623435AC-VDAT fit a standard PCIe slot or an OCP 2.0 slot?
No. This is an OCP 3.0 small-form-factor card. It requires a server with an OCP 3.0 SFF slot and is mechanically incompatible with standard PCIe stand-up slots and with OCP 2.0 mezzanine connectors.
Q. Does the MCX623435AC-VDAT support InfiniBand?
No. ConnectX-6 Dx EN is an Ethernet-only product line. This card does not operate as an InfiniBand adapter.
Q. What does the AC in MCX623435AC-VDAT indicate?
NVIDIA documents this OPN as Crypto and Secure Boot enabled, which supports inline crypto acceleration use cases such as IPsec offload on the ConnectX-6 Dx generation. Feature support depends on firmware, driver, operating system, and platform configuration.
Q. What switches work with the MCX623435AC-VDAT?
Typical platforms include NVIDIA Spectrum-2 and Spectrum-3 Ethernet switches with 200GbE QSFP56 ports. Existing 100GbE QSFP28 infrastructure can typically be used at reduced speed after verifying port configuration and cable qualification.
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 MCX623435AC-VDAT 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 and AI fabric design at no extra cost.