Detailed Specifications
HPE P25961-B21 Dual-Port 100 GbE Ethernet Network Adapter
Overview
The HPE P25961-B21 is a dual-port 100 Gb/s Ethernet adapter designed for HPE server platforms requiring high aggregate throughput. It features two QSFP28 ports and a PCI Express 4.0 ×16 host interface, delivering up to 200 Gb/s total bandwidth. The adapter supports advanced offload features such as RDMA/RoCE, SR-IOV and tunnel offloads, making it suitable for virtualization, storage fabrics and cloud data-centre deployments. It is compatible with HPE ProLiant and Apollo servers and integrates into HPE networking ecosystems.
Key Features
Two QSFP28 ports with 100 Gb/s per port (200 Gb/s aggregate)
PCI Express 4.0 ×16 host interface for full bandwidth support
Supports RDMA/RoCE, SR-IOV and tunnel offloads for reduced CPU load
Built on Mellanox ConnectX-6 EN chipset for high performance
Compact full-length low-profile PCIe plug-in format
Specifications
| Specification | Value |
|---|
| Brand | Hewlett Packard Enterprise (HPE) |
| Part Number | P25961-B21 |
| Product Type | Dual-Port 100 GbE Ethernet Network Adapter |
| Data Transfer Rate | 100 Gb/s per port (200 Gb/s aggregate) |
| Ports | 2 × QSFP28 |
| Host Bus Interface | PCI Express 4.0 ×16 |
| Chipset | Mellanox ConnectX-6 EN |
| Supported Offloads | RDMA/RoCE, SR-IOV, tunnel offloads (VXLAN/NVGRE) |
| Compliance Standards | IEEE 802.3by/bj/bm/ba |
| Typical Power Consumption | ≤ 9 W |
| Operating Temperature | 0 °C to 55 °C |
| Compatibility | HPE ProLiant / HPE Apollo server platforms |
| Dimensions (L × W) | ~6.6 in × 2.7 in |
| Weight | ≈ 0.5 lbs |
| Warranty | 90-Day Standard Warranty |
