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Home Networking Servers & Storage HPE 817749-B21 Ethernet 10/25Gb 2-Port FLR-SFP28 Adapter

HPE 817749-B21 Ethernet 10/25Gb 2-Port FLR-SFP28 Adapter

HPE 817749-B21 Ethernet 10/25Gb 2-Port FLR-SFP28 Adapter

Brand:

HPE

HPE 817749-B21 is the Ethernet 10/25Gb 2-port 640FLR-SFP28 adapter, based on the Mellanox ConnectX-4 Lx network processor. It is a FlexibleLOM adapter for supported HPE ProLiant servers, providing two SFP28 ports with 10GbE and 25GbE connectivity. Its 25GbE capability, RDMA support, virtualization features, tunnel offload, and PCIe Gen3 x8 interface make it suited to server virtualization, high-throughput data-center networking, and performance-sensitive workloads. H

OVERVIEW

HPE 817749-B21 is a dual-port 10/25GbE 640FLR-SFP28 FlexibleLOM adapter built around Mellanox ConnectX-4 Lx. Compatibility: Supported HPE ProLiant DL, ML and Apollo platforms; verify the exact server and FlexibleLOM support. Model comparison: 817749-B21 uses the FLR form factor; 817753-B21 is the comparable 2-port 640SFP28 stand-up adapter.

USE CASES

25GbE server networking – Provides two 10/25GbE SFP28 ports for bandwidth-intensive server connections.
Virtualized data centers – Supports virtualization-focused networking features to improve network efficiency in consolidated server environments.
High-performance computing – 25GbE connectivity and RDMA support make the adapter suitable for demanding compute and data-transfer workloads.
Cloud infrastructure – Adds high-speed network connectivity to compatible HPE server nodes used in private or hybrid cloud environments.
Network-intensive applications – Helps reduce network bottlenecks for workloads that can benefit from higher Ethernet throughput.
Storage networking – Supports Ethernet-based infrastructure where compatible protocols and network architecture are deployed.
Software-defined data centers – Tunnel offload support for VXLAN, NVGRE and GENEVE can help optimize virtualized overlay networking.
Low-latency applications – HPE documents the adapter's use with Messaging Accelerator technology for latency-sensitive workloads such as high-frequency trading.

KEY FEATURES

Dual SFP28 ports – Provides two network interfaces, allowing more connectivity capacity from one FlexibleLOM adapter.
10/25GbE support – Gives infrastructure teams a practical path from 10GbE to 25GbE networking.
Mellanox ConnectX-4 Lx processor – Provides a purpose-built network-processing architecture for demanding server workloads.
25GbE data rate – Delivers substantially more bandwidth per port than 10GbE for suitable infrastructure.
FlexibleLOM form factor – Integrates with supported HPE server FlexibleLOM designs without consuming a standard PCIe expansion slot.
PCIe Gen3 x8 interface – Provides the host-side bandwidth required for high-speed network operation.
RDMA with RoCE v1/v2 – Enables supported workloads to use remote direct memory access for efficient data movement.
Tunnel offload – Supports VXLAN, NVGRE and GENEVE offload for virtualized overlay networking.
DPDK support – Helps eligible applications use high-performance packet-processing frameworks.
Jumbo frames up to 9,600 KB – Supports large-frame networking configurations where the network infrastructure is configured accordingly.
PXE support – Enables supported network-based server deployment workflows.
IPv6 support – Provides compatibility with modern IPv6 network environments.
SFP28 connectivity – Works with supported 10Gb and 25Gb AOC/DAC cabling options.

TECHNICAL SPECIFICATIONS

Brand: HPE
Part Number: 817749-B21
Adapter Model: HPE Ethernet 10/25Gb 2-port 640FLR-SFP28
Network Processor: Mellanox ConnectX-4 Lx
Processor Model: MCX4121A-ACAT
Port Count: 2
Network Speed: 10GbE / 25GbE per port
Port Type:SFP28
Host Interface: PCIe Gen3 x8
Form Factor: FlexibleLOM
Supported Platform Family: HPE ProLiant DL, ML & Apollo
RDMA: Yes; RoCE v1/v2
DPDK: Supported
Tunnel Offload: VXLAN, NVGRE, GENEVE
Jumbo Frames: 9,600 KB
PXE: Supported
IPv6: Supported
Device-Level Firewall: Supported
Network Partitioning: Supported
SR-IOV: Supported
Receive Side Scaling: Supported
MSI-X: Supported
Power: Typical 10.5W; maximum 14.0W
Dimensions: 1.37 × 12.11 × 7.67 cm
Supported 10Gb Cables: AOC, DAC
Supported 25Gb Cables: AOC28, DAC28
Compatibility: Selected HPE ProLiant/Apollo servers; verify exact model
Fan: No
PSU: No
Adapter Type: Ethernet-only network adapter

Why Choose This Product?

25GbE upgrade path – Enables higher network bandwidth without moving directly to more expensive 40/100GbE infrastructure.
Two-port architecture – Provides dual network interfaces for separate connections, traffic segmentation or supported redundancy designs.
FlexibleLOM integration – Makes efficient use of supported HPE server architecture while preserving standard PCIe slots.
Mellanox networking technology – ConnectX-4 Lx provides advanced networking capabilities including RoCE and packet-processing features.
Virtualization-ready feature set – SR-IOV, network partitioning and tunnel offload support align with modern virtualized environments.
Deployment flexibility – SFP28 ports accommodate supported DAC and optical/AOC connectivity choices.
Performance-focused design – Suitable for HPC, virtualization, cloud and latency-sensitive applications requiring higher network throughput.
OEM HPE compatibility – Designed and documented for supported HPE server platforms, simplifying configuration and lifecycle management.

CUSTOMER REVIEW

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