NVIDIA Mellanox ConnectX-5 Ex EN MCX516A-BDAT
Dual-Port 40GbE PCIe 4.0 Standard-Height Ethernet Adapter
Host Interface
PCIe 4.0 x16
Port Count
2-port
Port Speed & Connector Type
40G QSFP28
Form Factor
Standard PCIe card (ConnectX-5 Ex)
Network Protocol / RDMA
Ethernet, RoCE v2
Product Description
The NVIDIA Mellanox ConnectX-5 Ex EN MCX516A-BDAT is a dual-port 40 Gigabit Ethernet adapter in a standard PCIe card form factor, built on the ConnectX-5 Ex silicon that adds native PCIe 4.0 x16 host interface support for higher aggregate bandwidth to the host. Each of its two QSFP28 ports delivers 40GbE connectivity with hardware-accelerated RoCE v2 RDMA, enabling low-latency, CPU-efficient data movement for storage and compute-intensive workloads. The card supports NVMe-oF offload, SR-IOV network virtualization, and advanced congestion control for lossless RDMA fabrics. This SKU is also cross-referenced under Lenovo OEM part numbers (4XC7A08229, SN37A18655, 01PE285), reflecting its qualification for Lenovo server platforms in addition to standard NVIDIA channel distribution, making it a flexible choice for enterprise, cloud, and OEM server deployments requiring PCIe Gen4 networking headroom.