NVIDIA Mellanox ConnectX-3 MCX312A-XCBT

The NVIDIA Mellanox ConnectX-3 MCX312A-XCBT is a dual-port 10 Gigabit Ethernet adapter card from the original ConnectX-3 EN generation, pairing two independent SFP+ ports with a PCIe 3.0 x8 host interface on a single MT27518A1-FCCR-XE controller. The dual-port design supports link aggregation, active/active or active/standby NIC teaming, and network redundancy configurations that a single-port card cannot provide, making it a common choice for production servers needing resilient 10GbE connectivity. Like other ConnectX-3 EN cards, it supports RDMA over Converged Ethernet (RoCE v1) for low-latency, CPU-offloaded data movement, along with stateless TCP/UDP/IP offloads, LSO, RSS and SR-IOV hardware virtualization. This model is also distributed under Lenovo OEM part number 00D9690, reflecting its long history as a qualified server NIC across major OEM server platforms. It remains a reliable, cost-effective way to add dual 10GbE RoCE ports to legacy or budget-focused server deployments.