NVIDIA Mellanox MCX312C-XCCT ConnectX-3 Pro EN 10GbE Dual-Port SFP+ PCIe 3.0 x8 NIC: This is a dual-port 10 Gigabit Ethernet network adapter built on the ConnectX-3 Pro EN ASIC. It uses two SFP+ cages and a PCIe 3.0 x8 host interface. This is a network interface card, not a stand-alone switch or transceiver. This is a refurbished unit.
Engineering Context
The ConnectX-3 Pro EN silicon adds RoCE v2, hardware-accelerated overlay tunneling for VXLAN and NVGRE, and stateless TCP offloads on top of the base ConnectX-3 EN feature set. The PCIe 3.0 x8 link delivers 8 GT/s per lane and supports both ports running at line rate concurrently. The card supports SR-IOV with up to 127 virtual functions per port. Typical power draw is approximately 6.5W. End-to-end latency for RoCE traffic is on the order of 1 microsecond.
Deployment & Use Cases
10GbE storage front-end for VMware vSAN and Hyper-V clusters. RoCE-enabled NVMe-over-Fabrics initiators in mid-range storage tiers. Hyperconverged infrastructure nodes where overlay encapsulation offload reduces CPU overhead. Low-cost upgrade path for legacy 1GbE servers entering a 10GbE leaf-spine fabric.
Technical Specifications
- OEM: NVIDIA Mellanox
- Part Number: MCX312C-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
- 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+ DAC, AOC, or transceiver — modules are not included. Not compatible with InfiniBand fabrics; this is the EN (Ethernet-only) variant of ConnectX-3 Pro. Not a VPI card. Will not negotiate above 10GbE per port. Some Dell and HP servers require an OEM-specific firmware variant for full iSCSI boot support; verify firmware compatibility before deployment.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every NIC for link-up on both ports, PCIe enumeration, and firmware integrity before shipment. Visit tes-itsolutions.com/quote for fabric design consultation. Global shipping with 1-3 day handling.