NVIDIA Mellanox MCX312B-XCCT ConnectX-3 Pro EN 10GbE Dual-Port SFP+ PCIe 3.0 x8 NIC: This is a dual-port 10 Gigabit Ethernet network adapter using the ConnectX-3 Pro EN silicon. It exposes two SFP+ cages and connects to the host via PCIe 3.0 x8. This is a network interface card, not a switch or a transceiver. This is a refurbished unit.
Engineering Context
The ConnectX-3 Pro EN ASIC adds hardware-accelerated VXLAN and NVGRE encapsulation/decapsulation, RoCE v1 and RoCE v2, and stateless TCP/UDP offloads to the standard ConnectX-3 EN feature set. The PCIe 3.0 x8 host link runs at 8 GT/s per lane and provides enough bandwidth to saturate both 10GbE ports simultaneously. SR-IOV is supported with up to 127 virtual functions per port. Typical power draw is approximately 6.5W. RoCE end-to-end latency is approximately 1 microsecond.
Deployment & Use Cases
10GbE leaf-side server NIC for vSphere/vSAN, Hyper-V, and KVM clusters. RoCE storage initiator for NVMe-over-Fabrics targets in mid-range tiers. Hyperconverged compute nodes where VXLAN offload reduces CPU consumption per packet. Migration from 1GbE to 10GbE for OpenStack and CloudStack hosts.
Technical Specifications
- OEM: NVIDIA Mellanox
- Part Number: MCX312B-XCCT
- ASIC: ConnectX-3 Pro EN
- Ports: 2 x SFP+
- Data Rate: 10GbE per port
- Host Interface: PCIe 3.0 x8 (8 GT/s)
- Protocols: Ethernet, RoCE v1/v2
- Offloads: Stateless TCP, VXLAN, NVGRE, SR-IOV
- Form Factor: Low-profile PCIe with full-height bracket option
- Typical Power: ~6.5W
- RoHS: RoHS R6 compliant
- Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Drivers available for VMware ESXi, Linux (MLNX_OFED and inbox), and Windows Server. Requires SFP+ direct attach copper, AOC, or optical transceiver — modules are not included. Not an InfiniBand or VPI card; this is the EN (Ethernet-only) variant of ConnectX-3 Pro. Will not operate above 10GbE per port. Server BIOS must enable above-4G decoding and SR-IOV in BIOS for full feature use.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS performs link-up validation on both ports, verifies firmware against the latest stable release, and inspects connector cages before shipment. Visit tes-itsolutions.com/quote for technical consultation. Global shipping with 1-3 day handling.