NVIDIA Mellanox® MCX4421A-ACQN — ConnectX Network Adapter

Specifications

OEM: NVIDIA Mellanox
Part Number (MPN): MCX4421A-ACQN
Category: ConnectX Network Adapter
ASIC / Family: ConnectX-4 Lx
Port Configuration: Dual-Port
Speed: 25GbE
Condition: Refurbished Grade A — bench-tested by T.E.S IT-SOLUTIONS


Identity
The NVIDIA Mellanox® MCX4421A-ACQN is a ConnectX-4 Lx dual-port 25GbE ConnectX Network Adapter. Refurbished Grade A — bench-tested in both link and signal-integrity checks by T.E.S IT-SOLUTIONS.

What This Is NOT

NOT a switch. Host-side PCIe adapter card — requires a server PCIe slot.
NOT a different ConnectX generation. This is ConnectX-4. Verify driver and firmware match this exact generation.
NOT a VPI dual-protocol card unless explicitly stated. Check protocol mode in specifications above.
NOT bundled with cables, transceivers, or low-profile bracket.


Capabilities & Features

RDMA over Converged Ethernet (RoCE v1/v2) and native InfiniBand verbs.
NVMe over Fabrics (NVMe-oF) support via RoCE v2 or InfiniBand transport.
ASAP² (Accelerated Switching and Packet Processing) for hardware-accelerated Open vSwitch.
SR-IOV virtualization for VM and container deployments.
Encapsulation/decapsulation acceleration: VXLAN, NVGRE, Geneve, GTP.
T10-DIF data-integrity offload for storage workloads.


Compatibility & Constraints

Drivers: NVIDIA MLNX_OFED (Linux), in-box mlx5_core (upstream Linux), WinOF-2 (Windows), nmlx5 (VMware ESXi).
Compatible switches: NVIDIA Spectrum.


Deployment & Use Cases

HPC clusters with RDMA / RoCE communication.
AI / ML training fabrics with GPUDirect-capable adapters.
NVMe-oF storage targets and initiators.
Virtualized data centers with SR-IOV.
SDN / NFV with ASAP2 hardware OVS acceleration.


Frequently Asked Questions (FAQ)
Q. What is the MCX4421A-ACQN?
The MCX4421A-ACQN is a ConnectX-4 Lx OCP 2.0 dual-port adapter at 25GbE Ethernet.
Q. Will it fit an OCP 3.0 slot?
No. This is an OCP 2.0 mezzanine card and requires an OCP 2.0 slot.
Q. Will T.E.S IT-SOLUTIONS confirm the configuration of MCX4421A-ACQN before shipping?
Yes. T.E.S IT-SOLUTIONS (tes-itsolutions.com) bench-tests each unit where test topology is available, before dispatch from EU stock.

Why T.E.S IT-SOLUTIONS
Every unit is bench-tested by T.E.S IT-SOLUTIONS: link establishment, port-by-port traffic validation, and full cosmetic inspection. Professional anti-static packaging, global B2B shipping from EU stock, and technical consultation for HPC / AI cluster deployments.