NVIDIA Mellanox ConnectX-6 Dx 50GbE Dual-Port SFP56 Ethernet Adapter - MCX623102AN-GDAT
This Ethernet network interface card (NIC) is the NVIDIA Mellanox MCX623102AN-GDAT, a ConnectX-6 Dx EN dual-port 50GbE adapter in PCIe half-height, half-length (HHHL) form factor. This is a refurbished unit, professionally tested and validated by T.E.S IT-SOLUTIONS. It is NOT an OCP 3.0 mezzanine card, and it does NOT include hardware crypto or Secure Boot functionality.
Engineering Context
The MCX623102AN-GDAT is built on the ConnectX-6 Dx ASIC and connects via PCIe Gen 4.0 x16 (SERDES at 16.0 GT/s), delivering up to 100 Gb/s aggregate bandwidth across both SFP56 ports. Each port operates at up to 50 Gb/s using PAM4 signaling over SFP56, with backward compatibility to 25GbE (NRZ), 10GbE, and 1GbE speeds. The adapter supports hardware offloads including RoCE v2, RDMA, SR-IOV, NVMe over Fabrics (NVMe-oF), VXLAN/GRE/Geneve tunnel offload, and Open vSwitch (OVS) acceleration via ASAP2 direct flow steering. PTP hardware timestamping with sub-20 microsecond accuracy is integrated.
Deployment and Use Cases
The MCX623102AN-GDAT is deployed in virtualized cloud environments running VMware ESXi, Proxmox, or KVM with SR-IOV passthrough for high-density VM networking. It serves NVMe-oF storage fabrics connecting initiators to NVMe targets over 50GbE RDMA. In HPC clusters, it provides low-latency RoCE v2 interconnects for MPI-based distributed computing. AI and machine learning training pipelines use it for GPU-to-GPU data movement via GPUDirect RDMA. Enterprise deployments leverage dual-port 50GbE for active-active link aggregation or failover in spine-leaf architectures on platforms including Dell PowerEdge, HPE ProLiant, and Supermicro servers.
Technical Specifications
Model: MCX623102AN-GDAT
Product Type: ConnectX-6 Dx EN Ethernet Adapter Card (NIC)
Ports: 2x SFP56
Speed per Port: Up to 50 Gb/s (PAM4); also supports 25/10/1 GbE
Aggregate Bandwidth: 100 Gb/s
PCIe Interface: Gen 4.0 x16 (SERDES at 16.0 GT/s)
Form Factor: PCIe HHHL (Half-Height, Half-Length), 142.00 mm x 68.90 mm
Bracket: Tall (Full-Height)
Offloads: RoCE v2, RDMA, SR-IOV, NVMe-oF, VXLAN/GRE, OVS ASAP2
PTP: Hardware timestamping, sub-20 µs accuracy
Crypto: Not enabled (N suffix = No Crypto)
Secure Boot: Not enabled
Condition: Refurbished
Compatibility and Hard Constraints
The MCX623102AN-GDAT uses SFP56 connectors and is NOT compatible with QSFP28 or QSFP56 cabling. It requires SFP56 DAC cables, SFP56 AOC cables, or SFP56 transceivers with LC fiber. The adapter fits standard PCIe x16 slots in rack-mount and tower servers. The tall bracket ships installed; a low-profile bracket is included for half-height chassis. It is NOT an OCP 3.0 card and will not fit OCP mezzanine slots. The MCX623102AC-GDAT is the crypto-enabled variant of this same adapter. The MCX623432AN-GDAB is the OCP 3.0 equivalent. This adapter is compatible with VMware ESXi, RHEL, Ubuntu, Windows Server, and Proxmox. OS driver support is provided via NVIDIA MLNX_OFED or inbox drivers.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS provides this MCX623102AN-GDAT as a professionally refurbished unit with full functional testing, including port validation, bandwidth verification, thermal checks, and firmware confirmation. Technical consultation is available to verify compatibility with your specific server platform and cabling infrastructure. Global shipping is available with 1-3 business day handling time.