The HPE Ethernet 10/25Gb 2-Port 640FLR-SFP28 Adapter is a high-performance, enterprise-class network interface card designed for HPE ProLiant Gen9 and Gen10 servers. Featuring dual SFP28 ports, this adapter supports both 10GbE and 25GbE connectivity, delivering exceptional bandwidth, low latency, and advanced offload capabilities for modern data center workloads.
Powered by the Mellanox ConnectX-4 Lx (MCX4121A-ACAT) network processor, the 640FLR adapter provides RDMA over Converged Ethernet (RoCE v1/v2), virtualization acceleration, and tunnel offloads, making it ideal for virtualization, cloud infrastructure, software-defined networking, and high-performance computing environments.
The part numbers 817749-B21 (Option Kit), 840139-001 (Spare), and 817747-001 (Assembly) all reference the same adapter model, ensuring full interchangeability.
Key Specifications
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Product Name: HPE Ethernet 10/25Gb 2-Port 640FLR-SFP28 Adapter
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HPE Part Numbers: 817749-B21, 840139-001, 817747-001
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Device Type: Network Adapter / NIC
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Form Factor: FlexibleLOM (Flexible LAN on Motherboard)
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Host Interface: PCI Express 3.0 x8
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Network Controller: Mellanox ConnectX-4 Lx (MCX4121A-ACAT)
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Ports: 2 × SFP28
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Supported Speeds: 10GbE and 25GbE
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Media Type: Optical fiber (SFP28 transceivers required)
Performance & Bandwidth
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Per-Port Bandwidth: Up to 50 Gb/s bi-directional
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Aggregate Bandwidth: Up to 100 Gb/s bi-directional (theoretical)
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Jumbo Frames: Up to 9.2 KB
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Power Consumption:
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Typical: 10.5 W
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Maximum: 14 W
Advanced Features
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RDMA Support: RoCE v1 and RoCE v2 for ultra-low latency and CPU efficiency
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Tunnel Offloads: VXLAN and NVGRE offload to optimize overlay networking
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Protocol Offloading: TCP/IP, UDP/IP checksum offload, LSO/TSO
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Virtualization: SR-IOV, VMware NetQueue, Microsoft VMQ
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Networking Standards: IPv4/IPv6, full-duplex, LACP, LLDP
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Management Features: Wake-on-LAN (WoL), link/activity LEDs
Server Compatibility
Ideal Use Cases
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Virtualized server environments
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Cloud and software-defined networking
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High-performance computing (HPC)
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Storage and database networking
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Low-latency enterprise data centers
The HPE 640FLR-SFP28 10/25Gb Dual-Port Adapter delivers enterprise-grade performance, advanced offload technologies, and flexible connectivity, making it a reliable and scalable networking solution for modern HPE ProLiant server infrastructures.
