Mellanox MCX4421A-ACAN ConnectX-4 NIC 25GbE 2-Port SFP28 Used
NVIDIA Mellanox ConnectX-4 Lx
The NVIDIA Mellanox ConnectX-4 Lx is a 10/25/40GbE network adapter by NVIDIA Mellanox, featuring PCIe 3.0 x8 host interface, RoCE v2 RDMA support, and VXLAN hardware offloads. With < 1.5 μs RDMA RDMA latency, it enables zero-CPU-copy data movement for HPC, AI/ML, and storage workloads.
| Specification | Details |
|---|---|
| Chip | ConnectX-4 Lx |
| Speeds | 10/25/40GbE |
| Lane Config | 1×40G QSFP+ / 2×10G SFP+ / 1×25G SFP28 / 2×25G SFP28 |
| Pcie | PCIe 3.0 x8 |
| Rdma | RoCE v2 |
| Protocols | Ethernet only (no IB) |
| Offloads | VXLAN, SR-IOV, NVMe-oF initiator |
| Latency | < 1.5 μs RDMA |
| Power | ≤ 15W |
Frequently Asked Questions
What is the ConnectX-4 Lx adapter?
The ConnectX-4 Lx is a cost-effective 10/25/40GbE Ethernet adapter with RoCE v2 RDMA support—targeted at cloud, telecom, and storage applications that don't require 100GbE.
Does ConnectX-4 Lx support InfiniBand?
No. The Lx variant is Ethernet-only. For dual Ethernet+InfiniBand, use ConnectX-4 (non-Lx) or ConnectX-5/6.
What's the difference between ConnectX-4 and ConnectX-4 Lx?
ConnectX-4 supports 100GbE + EDR IB with full RoCE v1/v2, while the Lx variant supports up to 40GbE Ethernet-only with RoCE v2 and fewer offloads—at roughly half the cost.
Can ConnectX-4 Lx be used for NVMe-oF?
Yes, as NVMe-oF initiator (host side). Target mode is available on ConnectX-4 and ConnectX-5 only.
Available at Zhongxin Data — enterprise network hardware specialists. Worldwide shipping from Hong Kong, China.