NVIDIA Mellanox ConnectX-3 MCX312B-XCBT
Ordering SKU See NVIDIA Price List | Dual-Port 10GbE SFP+ Adapter, PCIe 3.0 x8
Host Interface
PCIe 3.0 x8
Port Count
2-port
Port Speed & Connector Type
10GbE, SFP+
RDMA / Network Protocol
RoCE v1
Controller / ASIC
MT27518A1-FCCR-XE (ConnectX-3 EN)
Product Description
The NVIDIA Mellanox ConnectX-3 MCX312B-XCBT is a dual-port 10 Gigabit Ethernet network adapter built on the original ConnectX-3 EN ASIC (MT27518A1-FCCR-XE). Connecting through a PCIe 3.0 x8 host interface and two SFP+ cages, it delivers line-rate 10GbE throughput with hardware stateless offloads and RDMA over Converged Ethernet (RoCE v1) for low-latency, low-CPU-overhead storage and clustering traffic. First released in the early 2010s, the ConnectX-3 EN family remains one of the most widely deployed and best-validated 10GbE adapter platforms in the industry, with mature driver support across all major operating systems and hypervisors. It is a practical choice for organizations refreshing legacy server fleets, standardizing on a proven 10GbE fabric, or adding budget-friendly RDMA-capable ports to existing racks without the cost of newer-generation smart NICs.