HPE P25961-B21 

Dual‑Port 100 Gb QSFP28 Ethernet Network Adapter (Mellanox MCX623106AS‑CDAT)

The HPE P25961‑B21 is a high-performance Ethernet adapter offering two QSFP28 ports with 100 Gbps per port (200 Gbps aggregate). Built on the Mellanox MCX623106AS‑CDAT (ConnectX‑6 EN) chipset and supporting PCI Express 4.0 ×16, it delivers ultra-high data center bandwidth for workloads such as virtualization, storage fabrics, NFV, and cloud infrastructure. With hardware offloading for SR‑IOV, VXLAN/NVGRE tunneling, RoCE support, and digital optical diagnostics, this adapter maximizes throughput while minimizing CPU load—ideal for enterprise-grade, latency-sensitive deployments.

Features

Based on the advanced ConnectX‑6 EN architecture, this adapter provides dual QSFP28 ports capable of handling 100 Gb Ethernet each. It supports RDMA over Converged Ethernet (RoCE), SR‑IOV virtualization, GPU Direct, and tunnel offloads for VXLAN/NVGRE—delivering efficient data movement and low-latency performance in virtualized environments and storage fabrics. Its PCIe 4.0 ×16 host interface ensures full data transmission bandwidth, and integrated DOM (Digital Optical Monitoring) provides real-time visibility into link conditions, including temperature and optical power levels. With a typical power draw of ≤ 9 W and passive cooling, the adapter supports dense server applications and integrates cleanly with HPE ProLiant and Apollo platforms.

Advanced Options

This adapter is engineered for sustained performance under high-demand conditions. Its ConnectX‑6 EN foundation enables top-tier hardware offloading, dramatically reducing CPU utilization and improving VM density and networking efficiency.