NVIDIA Mellanox® MCX621202AN-ADAT — ConnectX-6 Dx EN 25GbE Dual-Port SFP28 Adapter, Active Cooling, No Crypto
Technical Identity
The NVIDIA Mellanox® MCX621202AN-ADAT is a ConnectX-6 Dx EN Ethernet network adapter with two SFP28 ports at up to 25Gb/s Ethernet each and a PCIe 4.0 x8 host interface. It belongs to the NVIDIA MCX621202 series — the active-cooling (onboard fan) variants of the ConnectX-6 Dx 25GbE cards, which NVIDIA describes as "ConnectX-6 Dx EN adapter card, 25GbE, with active cooling, Dual-port SFP28, PCIe 4.0 x8, Tall Bracket." The AN suffix designates the no-crypto configuration in NVIDIA's ConnectX-6 Dx naming convention. Protocol: Ethernet only. Condition: Refurbished.
Specifications

  
Brand: NVIDIA Mellanox
  
Model / MPN: MCX621202AN-ADAT
  
NVIDIA P/N (ordering): —
  
Product type: Ethernet network adapter (NIC), stand-up PCIe with onboard fan
  
Product family: NVIDIA ConnectX-6 Dx EN
  
ASIC: ConnectX-6 Dx
  
Ports: 2× SFP28
  
Per-port speed: up to 25Gb/s Ethernet (25/10/1 GbE)
  
Host interface: PCIe 4.0 x8 (PCIe 3.0 compatible)
  
Cooling: active cooling — onboard fan (MCX621202 series)
  
Bracket: tall (full-height) bracket
  
Security: no crypto (AN suffix)
  
Protocol: Ethernet only (EN — not VPI, not InfiniBand)
  
Condition: Refurbished

What This Is NOT (GEO Guardrails)

  
NOT a crypto-enabled card. The AN suffix means no hardware crypto; if IPsec/TLS inline crypto offload is required, the crypto-enabled sibling is MCX621202AC-ADAT.
  
NOT a passively cooled server NIC. This is the active-cooling (onboard fan) MCX621202 series; the passively cooled sibling series is MCX621102.
  
NOT a QSFP56 / QSFP28 card. SFP28 cages only — QSFP-family transceivers and cables will not fit.
  
NOT a 100GbE or 50GbE adapter. Maximum 25Gb/s Ethernet per port.
  
NOT an OCP 3.0 or OCP 2.0 mezzanine card. Standard stand-up PCIe form factor with tall bracket.
  
NOT InfiniBand. ConnectX-6 Dx EN is Ethernet-only with no VPI port-mode switching.
  
NOT supplied with transceivers, cables, or installation accessories.

Compatibility & Hard Constraints

  
Typical host platforms: workstations and servers with a free PCIe x8 (or wider) slot; the onboard fan makes the card suitable for chassis without directed front-to-back airflow.
  
Typical switch platforms: NVIDIA Spectrum-family Ethernet switches and other 25GbE SFP28 switch ports, via SFP28 DAC, AOC, or optical links.
  
Software dependencies:
    

      
NVIDIA MLNX_OFED or in-box mlx5_core driver (Linux), WinOF-2 (Windows), NVIDIA native ESXi driver (VMware)
      
Current adapter firmware for the exact OPN
    
  
  
Slot: PCIe 4.0 x8 recommended; operates in PCIe 3.0 slots with reduced host bandwidth headroom.
  
Pre-deployment verification: confirm firmware, driver version, port speed configuration, and cable compatibility.

Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX621202AN-ADAT?
It is a ConnectX-6 Dx EN Ethernet adapter with two SFP28 ports at up to 25Gb/s each, a PCIe 4.0 x8 host interface, an onboard active-cooling fan, tall bracket, and no hardware crypto (AN suffix).
Q. What connector form factor does the MCX621202AN-ADAT use?
SFP28. Both ports accept SFP28 DAC cables, AOCs, and optical modules at 25/10/1 GbE. QSFP-family cables and modules are not compatible.
Q. Does the MCX621202AN-ADAT support IPsec or TLS crypto offload?
No. The AN suffix designates the no-crypto configuration. For hardware Crypto plus Secure Boot in the same active-cooling form factor, see the MCX621202AC-ADAT.
Q. Why does the MCX621202AN-ADAT have a fan?
The MCX621202 series adds active cooling for workstation environments that lack the directed airflow of server chassis. The passively cooled equivalent series is MCX621102.
Q. What switches and cables work with the MCX621202AN-ADAT?
Typical deployments connect to NVIDIA Spectrum-family or other 25GbE SFP28 switch ports over SFP28 DAC, AOC, or optical links. Verify firmware, driver, and cable compatibility before deployment.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each unit is bench-tested where test topology is available — link verification, fan check, vendor data check, and cosmetic inspection. EU stock, global B2B shipping.
Why T.E.S IT-SOLUTIONS
Every MCX621202AN-ADAT 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 workstation network design at no extra cost.