Mellanox MCX4121A-ACAT ConnectX-4 NIC 25GbE 2-Port SFP28 PCIe3.0 Used
NVIDIA Mellanox ConnectX-4
The NVIDIA Mellanox ConnectX-4 is a 10/25/40/50/100GbE network adapter by NVIDIA Mellanox, featuring PCIe 3.0 x16 host interface, RoCE v1 & v2, RDMA over IB (up to 100 Gbps) RDMA support, and NVMe-oF target/initiator hardware offloads. With < 1.3 μs RDMA RDMA latency, it enables zero-CPU-copy data movement for HPC, AI/ML, and storage workloads.
Condition: Used — bench-tested in-house, cleaned, and verified. Ships with warranty coverage.
| Specification | Details |
|---|---|
| Chip | ConnectX-4 |
| Speeds | 10/25/40/50/100GbE |
| Lane Config | 1×100G QSFP28 / 2×50G / 4×25G |
| Pcie | PCIe 3.0 x16 |
| Rdma | RoCE v1 & v2, RDMA over IB (up to 100 Gbps) |
| Protocols | Ethernet, InfiniBand FDR10/EDR |
| Offloads | NVMe-oF target/initiator, VXLAN, SR-IOV, GPUDirect RDMA |
| Latency | < 1.3 μs RDMA |
| Power | ≤ 25W |
Frequently Asked Questions
\What is the ConnectX-4 network adapter?
The Mellanox ConnectX-4 is a 100GbE/EDR InfiniBand network adapter supporting RoCE v1/v2 RDMA, NVMe-oF, and GPUDirect—designed for HPC, cloud, and storage workloads.
Does ConnectX-4 support NVMe-oF?
Yes. ConnectX-4 supports NVMe-oF target and initiator modes for remote NVMe storage access over Ethernet or InfiniBand.
What PCIe generation does ConnectX-4 use?
PCIe 3.0 x16, providing up to 128 Gbps host bandwidth for 100GbE line-rate operation.
How does ConnectX-4 compare to ConnectX-5?
ConnectX-5 adds higher throughput (200GbE HDR), ConnectX-6 VPI mode, advanced NVMe-oF offloads, and PCIe 4.0 support. ConnectX-4 remains excellent for 100GbE deployments at lower cost.
Available at Zhongxin Data — enterprise network hardware specialists. Worldwide shipping from Hong Kong, China.