HPE  817749-B21 

640FLR‑SFP28 Dual‑Port 10/25 GbE FlexibleLOM Network Adapter

The HPE 817749‑B21 640FLR‑SFP28 is a high‑performance FlexibleLOM Network Adapter offering two 25 GbE-capableSFP28 ports (auto-negotiating down to 10 GbE). Perfect for ProLiant Gen9 and Gen10 rack and Apollo servers, this card delivers up to 100 Gb/s bi‑directional bandwidth per adapter. Engineered for virtualization, cloud workloads, and storage traffic, it accelerates performance while minimizing CPU overhead. With support for overlay tunneling (VXLAN, NVGRE) and RDMA over Converged Ethernet (RoCE), it streamlines overlay networking and offers future-proof scaling. This adapter suits environments needing ultra‑fast connectivity and seamless integration with existing fiber infrastructure.

Features

This dual-port SFP28 adapter leverages a Mellanox ConnectX‑4 Lx processor and PCIe 3.0 ×8 interface to deliver full line‑rate throughput across each port ([turn0search5], [turn0search11]). It supports jumbo frames up to 9.2 KB for efficient large-packet transfers, and includes advanced offload capabilities such as VXLAN/NVGRE tunnel processing and RoCE for reduced latency. Ideal for high-density virtualization and overlay networking, it eases network bottlenecks while providing backward compatibility with existing 10 GbE infrastructure.

Advanced Options

Built for demanding server and virtualization environments, this adapter delivers up to 50 Gb/s per port—and 100 Gb/s total—ensuring high-performance connectivity across workloads. Advanced offload engines like NVGRE tunnel and RDMA boost throughput while preserving CPU resources ([turn0search11]).