Shipping included*
Exclusions
Additional shipping fees may apply in rare circumstances for deliveries outside standard service areas. In most cases, this only potentially affects shipments to the Northwest Territories and Yukon, as well as certain heavy or oversized items.
HPE 817749-B21 817749-B21640FLR-SFP28 10/25Gb Dual-Port FlexibleLOM Adapter - PCIe 3.0 x 8 - SFP28 Optical Fiber
Business volume discounts
Technical guidance
Preparation & staging
QC · ON · AB · BC
Product Features
Technical Overview
This adapter operates at both 10Gb and 25Gb Ethernet speeds, providing flexibility for mixed-speed network environments and future-proofing for higher bandwidth requirements. The dual SFP28 ports support optical fiber media, enabling longer distance connections with superior signal integrity compared to copper alternatives.
The PCI Express 3.0 x8 interface delivers up to 8 GT/s per lane, ensuring the host connection doesn't bottleneck the 25Gb network performance. This combination of high-speed host interface and dual 25Gb ports makes the adapter suitable for bandwidth-intensive workloads where network throughput is critical.
Relevant factors for this section include Host Interface, Total Number of Ports, Expansion Slot Type. When those points are considered together, they give buyers a clearer picture of how the product is equipped, how it fits into deployment, and what kind of day-to-day role it is meant to support.
A strong technical summary explains how the product's interfaces, hardware profile, and operating characteristics work together in real deployment. Buyers often need this context to confirm compatibility with existing devices, expected performance in daily use, and whether installation will be straightforward for IT staff or end users.
Key Product Advantages
The HPE 640FLR-SFP28 adapter offers several advantages for enterprise server deployments. Its dual-port design allows network teaming configurations for redundancy and load balancing, while the 10/25Gb speed capability provides a clear upgrade path from existing 10Gb infrastructure.
High-Density Connectivity
Adds two high-speed network ports using a single FlexibleLOM slot, maximizing port density in rack-mounted server environments where space is at a premium.
- Dual 25Gb ports in compact form factor
- Ideal for blade and rack server deployments
Optical Fiber Support
SFP28 optical fiber ports enable reliable data transmission over longer distances with immunity to electromagnetic interference, perfect for data center cross-connects.
- Superior signal integrity
- Extended reach capabilities
Server-Optimized Design
Specifically engineered for server environments with FlexibleLOM form factor that integrates directly into compatible HPE server platforms for streamlined deployment.
- Direct server integration
- Reduced cabling complexity
Deployment / Use Cases
This adapter is particularly well-suited for cloud infrastructure and web-scale environments where high bandwidth between servers is essential. Its 25Gb capability addresses the growing demands of virtualized workloads, big data analytics, and high-performance computing clusters that require substantial network throughput.
In storage networking scenarios, the adapter can facilitate high-speed connections between servers and storage arrays, reducing data transfer bottlenecks in SAN environments. The dual-port configuration also supports network redundancy setups, ensuring continuous availability for mission-critical applications.
Relevant factors for this section include Host Interface, Total Number of Ports, Expansion Slot Type. When those points are considered together, they give buyers a clearer picture of how the product is equipped, how it fits into deployment, and what kind of day-to-day role it is meant to support.
Physical Profile
The FlexibleLOM form factor measures 3" wide by 4.80" deep by 0.54" high (76.20 x 121.92 x 13.72 mm) and weighs approximately 3.52 ounces (99.79 grams). This compact design allows direct integration into compatible HPE server chassis without occupying standard PCIe expansion slots, making efficient use of limited server real estate while maintaining full 25Gb networking capability.
The physical profile is practical for deployment planning because the dimensions and weight are clearly defined: 0.54" (13.72 mm), 3" (76.20 mm), 4.80" (121.92 mm), 3.52 oz (99.79 g). This helps confirm rack, shelf, desk, or cabinet fit before installation.
- Width
- 3" (76.20 mm)
- Depth
- 4.80" (121.92 mm)
- Height
- 0.54" (13.72 mm)
- Weight
- 3.52 oz (99.79 g)
Highlights
- Dual-port 10/25Gb Ethernet adapter for high-bandwidth server networking
- PCI Express 3.0 x8 host interface ensures no bottleneck for 25Gb performance
- SFP28 optical fiber ports support longer distance connections with superior signal integrity
- FlexibleLOM form factor integrates directly into compatible HPE server platforms
- Ideal for cloud, virtualization, and high-performance computing environments
- Supports network teaming for redundancy and load balancing
- Compact dimensions (3" x 4.80" x 0.54") optimize server space utilization
- Specifically designed for server deployments with enterprise-grade reliability
Specifications
| Specifications | |
|---|---|
| Manufacturer | Hewlett Packard Enterprise |
| Manufacturer Part Number | 817749-B21 |
| Brand Name | HPE |
| Product Model | 640FLR-SFP28 |
| Product Name | Ethernet 10/25Gb 2-port 640FLR-SFP28 Adapter |
| Product Type | 25Gigabit Ethernet Card |
| Interfaces/Ports | |
| Host Interface | PCI Express 3.0 x8 |
| Total Number of Ports | 2 |
| I/O Expansions | |
| Expansion Slot Type | SFP |
| Media & Performance | |
| Media Type Supported | Optical Fiber |
| Physical Characteristics | |
| Form Factor | FlexibleLOM |
| Height | 0.54" (13.72 mm) |
| Width | 3" (76.20 mm) |
| Depth | 4.80" (121.92 mm) |
| Weight (Approximate) | 3.52 oz (99.79 g) |
| Miscellaneous | |
| Device Supported | Server |
FAQ
What types of servers is this adapter compatible with?
The HPE 640FLR-SFP28 adapter is designed for server deployments and specifically engineered for integration with compatible HPE server platforms that support the FlexibleLOM form factor. It's not intended for standard desktop or workstation use, but rather for enterprise server environments where high-density, high-speed networking is required.
Can this adapter operate at both 10Gb and 25Gb speeds?
Yes, this adapter supports both 10Gb and 25Gb Ethernet speeds, providing flexibility for mixed-speed network environments. This dual-speed capability allows for gradual migration from existing 10Gb infrastructure to 25Gb without requiring immediate replacement of all network components, offering a cost-effective upgrade path for growing bandwidth requirements.
What type of cables and transceivers does this adapter require?
This adapter features SFP28 ports that support optical fiber media. You'll need compatible SFP28 optical transceivers and corresponding fiber optic cables (typically LC connectors) to establish network connections. The specific transceiver models should be verified for compatibility with your network switch infrastructure to ensure optimal performance.
How does the FlexibleLOM form factor differ from standard PCIe cards?
The FlexibleLOM (Flexible LAN on Motherboard) form factor is specifically designed for integration into compatible server platforms, typically connecting directly to the server motherboard rather than occupying a standard PCIe expansion slot. This design maximizes server density by conserving PCIe slots for other expansion cards while still providing full 25Gb networking capability through a dedicated, optimized interface.
What is the maximum bandwidth this adapter can achieve?
With its PCI Express 3.0 x8 host interface, this adapter can achieve up to 8000MB/s of bandwidth, ensuring the host connection doesn't bottleneck the dual 25Gb network ports. This substantial bandwidth capacity makes it suitable for data-intensive applications where high network throughput between servers is critical for performance.
Can both ports on this adapter be used simultaneously?
Yes, both SFP28 ports on this adapter can operate simultaneously, providing either independent network connections or combined throughput through teaming configurations. This dual-port capability enables network redundancy for high-availability deployments, load balancing across multiple links, or separate connections to different network segments from a single server.
| Qty | Price | Available |
|---|
