MCX631111AS-ADAT Mellanox CONNECTX-6 Lx En Adapter 25GBE SINGLE-PORT SFP28 PCIe 4.0 X8 Secure Boot

MCX631111AS-ADAT Mellanox CONNECTX-6 Lx En Adapter 25GBE SINGLE-PORT SFP28 PCIe 4.0 X8 Secure Boot

Mellanox / NVIDIA Networking component — ConnectX NIC / InfiniBand HCA / BlueField DPU / Spectrum Ethernet Switch / Quantum InfiniBand Switch / transceiver / cable for HPC + AI training + datacenter fabric infrastructure. (Mellanox Technologies acquired by NVIDIA in 2020 — products continue under NVIDIA Networking brand, still labeled 'Mellanox' in many catalogs.)

Specifications

• Part Number: MCX631111AS-ADAT
• Brand: Mellanox
• Family: ConnectX-3/4/5/6/7/8 (NIC) / BlueField-2/3 (DPU) / Spectrum SN-series (Ethernet) / Quantum QM-series (InfiniBand) — see PN
• Speed: 10G / 25G / 40G / 50G / 100G / 200G / 400G / 800G — see PN
• Port Count: SP / DP — see PN; switches: 16/32/40/64 ports
• Interface: PCIe Gen3 x8/x16 (CX-4/5) / Gen4 x16 (CX-6/BF-2) / Gen5 x16 (CX-7/BF-3) — see PN
• Connector: SFP+/SFP28/SFP56 / QSFP+/QSFP28/QSFP56/QSFP-DD/OSFP — see PN
• Protocol: Ethernet (RoCE v2) / InfiniBand (EDR/HDR/NDR) — dual-protocol on ConnectX (firmware-switchable)

Compatibility

Mellanox ConnectX adapters support BOTH Ethernet and InfiniBand on same hardware (dual-protocol via mlxconfig firmware). AI training favors InfiniBand (NCCL all-reduce, MPI collectives); datacenter ToR fabrics use Ethernet with RoCE v2 (PFC + ECN flow control).

• ConnectX-3 (Gen3, legacy): 10/40G Ethernet + FDR InfiniBand — pre-2017 deployments
• ConnectX-4 / CX-4 Lx (Gen3 x8/x16): 25/40/50/100G Ethernet + EDR (100G) InfiniBand — 2017+ mainstream
• ConnectX-5 (Gen3 x16): 25/40/50/100G + EDR IB + first-gen RDMA offload — 2018+
• ConnectX-6 (Gen4 x16): 25/50/100/200G Ethernet + HDR (200G) InfiniBand — 2020+ mainstream
• ConnectX-7 (Gen5 x16): 100/200/400G Ethernet + NDR (400G) InfiniBand — current flagship for H100/H200 AI training fabric
• ConnectX-8 (Gen5 x16): 800G NDR/XDR — for Blackwell AI cluster fabric
• BlueField-2 DPU: SoC + ConnectX-6 — SDN / storage / security offload
• BlueField-3 DPU: Arm cores + ConnectX-7 — production DPU platform
• Spectrum SN-series Ethernet Switch: SN2700/SN2410/SN3700/SN4700/SN5600 — 25/100/400/800G Ethernet ToR-spine
• Quantum QM-series InfiniBand Switch: QM8700 (HDR), QM9700 (NDR), QM9790 (NDR Spine) — managed IB switching
• Server compatibility: Dell PowerEdge / HPE ProLiant Gen10+ / Lenovo ThinkSystem SR-series / Cisco UCS C-series / Supermicro — PCIe Gen3/4/5 + OCP 3.0 slots

Use Cases

AI training fabric (NCCL all-reduce for distributed PyTorch / Megatron / DeepSpeed on 8x H100 / H200 SXM5 nodes — InfiniBand NDR preferred), HPC interconnect (MPI over InfiniBand for CFD / FEA / weather modeling), storage networking (NVMe-oF over RoCE v2 — 25/100/400G), enterprise datacenter ToR (Spectrum SN-series for 100/400G fabrics), software-defined networking offload (BlueField DPU for OVS / vSwitch / Geneve VXLAN), zero-trust security offload, container networking with Cilium eBPF accelerated by DPU.

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