NVIDIA Mellanox ConnectX-3 Pro MCX312B-XCCS

The NVIDIA Mellanox ConnectX-3 Pro MCX312B-XCCS is a dual-port 10 Gigabit Ethernet adapter card built on the ConnectX-3 Pro EN controller (MT27528A0-FCCR-XE), pairing two independent SFP+ ports with a PCIe 3.0 x8 host interface. It is physically identical to the MCX312B-XCCT variant, with the two part numbers differing primarily in bracket or packaging/order-code configuration rather than core networking function. The card provides the full ConnectX-3 Pro feature set: hardware offload for VXLAN and NVGRE overlay network encapsulation, enhanced RoCE v1 for low-latency RDMA, stateless TCP/UDP/IP offloads, LSO, RSS, and SR-IOV virtualization support. The dual-port design supports NIC teaming, link aggregation and redundant network paths, making it suitable for production servers requiring resilient 10GbE connectivity. As part of NVIDIA's mature ConnectX-3 Pro lineup, the MCX312B-XCCS is a dependable, cost-effective option for virtualization-heavy environments, storage networking, and budget-focused 10GbE data center refresh projects.