NVIDIA Mellanox MCX312B-XCCT ConnectX-3 Pro EN 10GbE Dual-Port SFP+ PCIe 3.0 x8 NIC: This is a low-profile dual-port 10 Gigabit Ethernet network adapter built on the Mellanox ConnectX-3 Pro EN ASIC, with two SFP+ cages and a PCI Express 3.0 x8 (8 GT/s) host interface. MPN: MCX312B-XCCT. This IS a server-class Ethernet NIC engineered for virtualised and cloud workloads requiring hardware offload, RoCE, and SR-IOV. This IS NOT an InfiniBand-only adapter, a single-port card, nor a 25/40/100 GbE part. Condition: New (factory sealed, RoHS R6).
Engineering Context
ConnectX-3 Pro EN extends the ConnectX-3 family with hardware support for overlay networks (VXLAN and NVGRE) and stateless TCP/UDP/IP offload, along with RDMA over Converged Ethernet (RoCE v1) for low-latency storage and HPC traffic over standard Ethernet fabrics. The 10GBASE-R PCS, line-side SFP+ cages, and PCIe 3.0 x8 host link give the card sufficient bandwidth headroom to drive both ports at line rate without host-bus contention. The adapter supports SR-IOV with up to 127 virtual functions per port for dense hypervisor deployments.
Deployment & Use Cases
VMware ESXi vSAN and NSX hosts requiring hardware VXLAN offload; KVM and Hyper-V deployments using SR-IOV to pin virtual functions to guests; iSCSI and NVMe-over-RDMA storage initiators on RoCE fabrics; high-density cloud and OpenStack compute nodes; financial-services low-latency trading hosts; and Hadoop / Spark analytics clusters where 10 GbE per node is the bandwidth target.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX312B-XCCT
Product Family: ConnectX-3 Pro EN
Ports: 2x SFP+ (Dual-Port)
Data Rate: 10 GbE per port
Host Interface: PCI Express 3.0 x8 (8 GT/s)
Form Factor: Low-profile half-length
Protocols: Ethernet 10GBASE-R, RoCE v1
Overlay Offload: VXLAN, NVGRE stateless offload
Virtualization: SR-IOV, up to 127 VFs per port
Compliance: RoHS R6
Condition: New — Factory Sealed
Compatibility & Constraints
Compatible with PCI Express 3.0 x8 host slots (and PCIe 2.0 slots at reduced bandwidth), Mellanox-qualified SFP+ direct-attach copper and optical transceivers, and modern Linux distributions, Windows Server, and VMware ESXi releases that ship the mlx4_en driver. Not compatible with InfiniBand-only ports without VPI firmware, PCI Express 1.0 host slots at full performance, 25 GbE / 40 GbE / 100 GbE link rates, or QSFP-only switches. SFP+ optics and DACs are sold separately.
Why Choose T.E.S IT-SOLUTIONS
Each MCX312B-XCCT supplied by T.E.S IT-SOLUTIONS arrives in factory-sealed packaging with the original Mellanox label intact. T.E.S IT-SOLUTIONS handles every order within 1–3 business days and provides expert consultation on ConnectX-3 Pro firmware levels, VXLAN-offload deployment, and SR-IOV sizing. Request a quote.