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Reliable 1GbE adapter with stable throughput across all ports.
684208-B21
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HPE Ethernet 1GbE 4P 331FLR FIO Adptr
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684208-B21
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- HPE Ethernet 1GbE 4P 331FLR FIO Adptr
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684208-B21 Overview
684208-B21 is a high-performance USB-to-Ethernet adapter built to deliver reliable 1Gbps data rates through a robust USB 3.0 connection interface. It supports essential network protocols such as TCP/IP and UDP, ensuring seamless compatibility with Windows, Linux, and macOS operating systems, and is engineered for effortless integration into diverse network environments.
Designed in an external USB form factor, the 684208-B21 caters ideally to small office networks, gaming setups, and high-speed workstations. With features including auto-negotiation, Wake-on-LAN, Jumbo Frames, and QoS, this adapter optimizes network performance while its compact design and adherence to operating temperature ranges (0 to 70°C) make it a dependable choice for professionals on the move.
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684208-B21 Specifications
- Product Type
- Network Adapter
- Adapter Type
- USB-to-Ethernet
- Data Rate
- 1Gbps
- Connection Interface
- USB 3.0
- Supported Protocols
- TCP/IP, UDP
- Form Factor
- External USB Device
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 5V
- Compatibility
- Windows, Linux, macOS
- Max Speed
- 1Gbps
- Supported Features
- Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS
- Power Consumption
- N/A
- Connector Type
- RJ-45
- Maximum Range
- 100 meters
- Bus Type
- USB 3.0
- Product Name
- 684208-B21 USB-to-Ethernet Adapter
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
684208-B21 Use Case
Virtualization Acceleration in Enterprise VDI Environments
In a financial services firm running VMware Horizon on HPE ProLiant DL380 Gen10 servers, the 684208-B21 HPE Ethernet 1GbE 4P 331FLR FIO Adapter delivers four dedicated 1 GbE ports per server. Benefit: Achieves predictable network throughput and ultra-low latency per virtual desktop, simplifies vSwitch port mapping, and reduces VM network contention—ensuring high-performance, secure VDI delivery with minimal downtime.
High-Density Cloud and Hyperscale Data Centers
A cloud-hosting provider deploying HPE Synergy compute modules leverages the 4-port 1 GbE 331FLR FIO Adapter to maximize network density in half-height slots. Benefit: Consolidates cabling and fiber-optic footprints, frees PCIe lanes for storage controllers, and scales out network interface capacity without additional mezzanine cards—driving higher rack-unit efficiency and lower total cost of ownership.
Edge Computing and IoT Analytics at Retail Locations
A national retail chain equips HPE ProLiant Apollo edge servers with the 684208-B21 adapter to manage local caching, PoS systems, and real-time inventory analytics. Benefit: Provides resilient 1 GbE failover across four independent ports, minimizes latency for in-store transactions, and reduces WAN backhaul traffic—delivering consistent customer experiences and faster decision-making at the network edge.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 684208-B21 |  869585-B21 |  Q6M15A |  700760-B21 |  872725-B21 | |
|---|---|---|---|---|---|
| Product Type | Network Adapter | Network Adapter | Network Adapter | Network Adapter | Network Adapter |
| Adapter Type | USB-to-Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Data Rate | 1Gbps | 10Gbps | 10Gbps | 10Gbps | 10Gbps |
| Connection Interface | USB 3.0 | PCIe x4 | PCIe | PCIe | PCIe |
| Supported Protocols | TCP/IP, UDP | TCP/IP, UDP, iSCSI | TCP/IP, UDP | TCP/IP, UDP | TCP/IP, UDP |
| Form Factor | External USB Device | Internal PCIe Card | Internal PCIe Card | Internal PCIe Card | Internal PCIe Card |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 5V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Windows, Linux, macOS | Windows, Linux, macOS, VMware, Hyper-V | Windows, Linux, macOS | Windows, Linux, macOS | Windows, Linux, macOS, VMware, Hyper-V |
| Max Speed | 1Gbps | 10Gbps | 10Gbps | 10Gbps | 10Gbps |
| Supported Features | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS |
| Power Consumption | N/A | 12W | 5W | N/A | N/A |
| Connector Type | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| Maximum Range | 100 meters | 100 meters | 100 meters | N/A | N/A |
| Bus Type | USB 3.0 | PCIe x4 | PCIe x4 | PCIe x4 | PCIe x4 |
| Product Name | 684208-B21 USB-to-Ethernet Adapter | 869585-B21 10Gbps Ethernet Adapter | Q6M15A 10Gbps PCIe Ethernet Adapter | 700760-B21 High Performance Network Adapter | 872725-B21 High-Performance Ethernet Network Adapter |
| Height | N/A | 1.5 inches | N/A | N/A | N/A |
| Width | N/A | 3.5 inches | N/A | N/A | N/A |
| Depth | N/A | 0.5 inches | N/A | N/A | N/A |
| Weight | N/A | 0.8 lbs | N/A | N/A | N/A |
Reviews & Ratings
A
Ahsan Rafiq
4
Installed cleanly in ProLiant servers and worked instantly.
J
Julian Moore
5
Good option for legacy workloads needing consistent networking.
O
Omar Siddiqui
5
OEM quality with zero driver issues.
T
Thomas Keller
4
Solid performance for basic server connectivity.
Questions & Answers
What is the HPE Ethernet 1GbE 4P 331FLR FIO Adapter (SKU: 684208-B21)?
The HPE Ethernet 1GbE 4P 331FLR FIO Adapter is a four-port 1 GbE FlexibleLOM network adapter designed for HPE ProLiant servers, providing high-performance connectivity and offload capabilities.
Which HPE server platforms are compatible with the 331FLR FIO Adapter?
This adapter is compatible with HPE ProLiant Gen9 and Gen10 DL, ML and BL series servers that feature a FlexibleLOM (FLR) slot.
What does “4P” signify in the 1GbE 4P 331FLR FIO Adapter?
“4P” indicates that the adapter provides four independent 1 GbE network ports for simultaneous, low-latency connectivity.
What is the FlexibleLOM (FLR) form factor?
FlexibleLOM (FLR) is a server expansion slot that enables tool-less installation of network adapters without occupying PCIe slots.