NVIDIA Mellanox MCX314A-BCCT ConnectX-3 Pro EN Dual-Port 40/56GbE QSFP+ PCIe 3.0 x8 Adapter, Lot of 5: This is a dual-port 40/56GbE Ethernet network interface card based on the Mellanox ConnectX-3 Pro EN ASIC, in standard PCIe form factor with two QSFP+ cages. MPN MCX314A-BCCT. This is NOT an InfiniBand VPI card, NOT a single-port card, NOT a 100GbE adapter, and NOT an OCP mezzanine. Sold as a Lot of 5, refurbished and tested.
Engineering Context: ConnectX-3 Pro EN delivers up to 56GbE per port (Mellanox Ethernet) over QSFP+ with NRZ signaling, on a PCIe Gen3 x8 host interface. The Pro variant adds NVGRE and VXLAN hardware offload for tunneled overlay traffic. RDMA over Converged Ethernet (RoCE) is supported for low-latency RDMA workloads. Stateless hardware offloads include TCP/UDP/IP checksum, LSO, LRO, and VLAN tagging. SR-IOV is supported for virtualized environments.
Deployment & Use Cases: 40GbE / 56GbE leaf-spine uplinks, Microsoft Storage Spaces Direct and VMware vSAN with RoCE, Ceph and NFS / SMB storage nodes, NVGRE / VXLAN overlay endpoints in Hyper-V and OpenStack environments, and HPC / machine-learning training clusters needing dual-port redundancy.
Technical Specifications:
MPN: MCX314A-BCCT
Controller: Mellanox ConnectX-3 Pro EN
Ports: 2x QSFP+
Speed: 40GbE and 56GbE Ethernet
Host Interface: PCI Express 3.0 x8
Form Factor: Standard PCIe
Protocol Support: 40/56GbE Ethernet, RoCE
Overlay Offloads: NVGRE, VXLAN (Pro feature)
Stateless Offloads: TCP/UDP/IP checksum, LSO, LRO, VLAN tagging
Virtualization: SR-IOV
Pack Quantity: Lot of 5
Condition: Refurbished, tested
Brand: NVIDIA Mellanox
Compatibility & Constraints: Supported on Linux (in-kernel mlx4_en driver), VMware ESXi, Microsoft Windows Server with vendor drivers. Accepts QSFP+ passive copper DAC, active optical cables, and SR4 / LR4 optical transceivers at 40/56GbE rates. NOT an InfiniBand VPI adapter — the BCCT SKU is Ethernet-only (EN). NOT compatible with 100GbE QSFP28 or 200GbE QSFP56 ports. Does NOT fit OCP slots.
Why TES: T.E.S IT-SOLUTIONS specializes in refurbished NVIDIA Mellanox enterprise networking hardware. Each MCX314A-BCCT card is bench-tested before shipment. Handling time 1–3 business days. Request a quote.