P26259-B21 is an HPE enterprise Ethernet network adapter designed for HPE ProLiant servers. It’s a dual-port 10GbE SFP+ adapter based on the Broadcom BCM57412 controller, delivering reliable, low-latency network connectivity for enterprise, virtualization, and storage workloads.
Why buyers pick P26259-B21 (plain English)
Proven 10GbE performance Broadcom 57412 silicon is widely used for stable, predictable 10Gb networking in data centers.
Dual-port flexibility Supports redundancy, link aggregation, or traffic separation across two SFP+ ports.
Virtualization-ready Well suited for VMware, Hyper-V, and other virtualized environments.
Efficient CPU offload Reduces host CPU overhead for network traffic compared to basic NICs.
HPE-qualified reliability Firmware and drivers are validated by HPE for ProLiant server platforms.
60-second spec box (P26259-B21)
Adapter type Ethernet network adapter
Ports 2 × SFP+
Speed 10GbE
Controller Broadcom BCM57412
Form factor PCIe stand-up adapter
Host interface PCIe Gen3
Supported media SFP+ DAC cables or optical transceivers
Platform HPE ProLiant servers
Use case Enterprise networking, virtualization, storage traffic, and general data center workloads.
You need higher bandwidth → 25Gb or faster adapters
You need copper Ethernet → RJ-45 NICs
You want to preserve PCIe slots → OCP or FLR adapters
TL;DR
P26259-B21 is HPE’s dual-port 10GbE SFP+ adapter based on Broadcom 57412: a ProLiant-validated, enterprise-grade NIC delivering stable 10Gb connectivity for modern server workloads.
HPE ProLiant Gen10 Plus servers and some Gen11 servers
Features and benefits
Performance:The adapter's dual SFP+ ports deliver 10GbE network speeds, which is ideal for data-intensive server applications.
CPU Offloading:Supports Remote Direct Memory Access (RDMA) over Converged Ethernet (RoCE), which reduces the network processing load on the server's CPU.
Enhanced Security:Features like digitally signed firmware and a hardware root-of-trust help prevent the installation of unauthorized software.
Virtualization:Optimized for virtualized environments, supporting Single Root I/O Virtualization (SR-IOV) and Network Partitioning (NPAR) to improve performance and efficiency.
Flexible Connectivity:It can utilize a variety of SFP+ transceivers, including direct attach copper (DAC) cables, active optical cables (AOC), and fiber optic modules.
