817753-B21 - HPE Ethernet 10/25Gb 2-port 640SFP28 Adapter

HPE 817753-B21 — Ethernet 10/25Gb 2-Port 640SFP28 Adapter

What it is

817753-B21 is an HPE enterprise Ethernet network adapter designed for HPE ProLiant servers.
It’s a dual-port 10/25Gb SFP28 PCIe adapter that delivers high-throughput, low-latency connectivity for modern data center, virtualization, and storage workloads.

Why buyers pick 817753-B21 (plain English)

Flexible 10Gb → 25Gb networking
Supports both 10GbE and 25GbE, allowing easy bandwidth upgrades without replacing the adapter.

PCIe stand-up adapter
Installs in a standard PCIe slot, making it ideal for servers without FlexibleLOM support.

Dual-port redundancy and performance
Two SFP28 ports enable link aggregation, failover, or traffic separation.

Built for modern workloads
Well-suited for virtualization, hyperconverged infrastructure, and high-speed storage traffic.

ProLiant-qualified reliability
HPE-tested firmware and drivers ensure stable operation and long-term support.

60-second spec box (817753-B21)

Adapter type
Ethernet network adapter

Ports
2 × SFP28

Speed
10GbE / 25GbE

Form factor
PCIe stand-up adapter

Host interface
PCIe Gen3

Supported media
SFP28 DAC cables or optical transceivers

Platform
HPE ProLiant servers

Use case
High-bandwidth server networking, virtualization, storage, and cloud workloads.

Where it fits (and when to choose something else)

Perfect for:

• ProLiant servers using PCIe expansion slots

• Virtualized and HCI environments

• Storage networking (iSCSI, NFS, vSAN)

• 10Gb to 25Gb Ethernet upgrades

Choose something else if:

• You want to preserve PCIe slots → choose FLR/FlexibleLOM adapters

• You need copper Ethernet → choose RJ-45 NICs

• You need higher speeds → consider 40Gb or 100Gb adapters

TL;DR

817753-B21 is HPE’s dual-port 10/25Gb SFP28 PCIe Ethernet adapter:
a high-performance networking solution for ProLiant servers that need flexible, future-ready bandwidth.