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Reliable 1GbE adapter with stable throughput across all ports.
684208-B21
HPE Ethernet 1GbE 4P 331FLR FIO Adptr
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684208-B21
- Description:
- 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.
What does FIO stand for in this adapter’s name?
FIO stands for FlexibleLOM IO, indicating the adapter leverages the FlexibleLOM interface for flexible installation and hot-plug support.
What network protocols and features does the adapter support?
The adapter supports IEEE 802.3 Ethernet standards, VLAN tagging, jumbo frames up to 9 KB, checksum offload, and TCP/IP segmentation offload.
What kind of performance can I expect from the 1GbE 4P 331FLR adapter?
Expect up to 1 Gbps line-rate per port, minimal CPU utilization thanks to offload engines, and sub-microsecond latency for each link.
Which operating systems are supported by this HPE adapter?
Supported operating systems include various versions of Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi, and other major distributions.
Are drivers included for the HPE 1GbE 4P 331FLR FIO Adapter?
Drivers are not included in the box but can be downloaded from HPE Support Center, ensuring you always have the latest certified release.
How do I install the 331FLR FIO Adapter in my server?
Power down the server, remove the FLR blanking bracket, align the adapter with the FlexibleLOM slot, press until it clicks, then secure the latch and power up.
Can I hot-swap this adapter without shutting down the server?
Yes. The adapter supports hot-plug when installed in a server with hot-plug-capable FlexibleLOM slots and appropriate firmware.
What warranty and support options come with SKU 684208-B21?
HPE provides a one-year limited warranty backed by global support and the option to purchase Foundation Care or Proactive Care service contracts.
What are the power and thermal specifications of the adapter?
The adapter consumes approximately 4 W under full load and operates in ambient temperatures from 10 °C to 35 °C with standard server airflow.
Does the 331FLR FIO Adapter support virtualization offloads?
Yes. It supports VMware NetQueue, Microsoft VMQ, Single Root I/O Virtualization (SR-IOV) and other hardware offload features for virtualized workloads.
What cables or transceivers are required for this adapter?
The adapter uses standard RJ-45 connectors; customers must procure CAT5e/CAT6 Ethernet cables separately, as none are included.
Where can I find detailed documentation for 684208-B21?
Comprehensive product briefs, user guides and interoperability matrices are available on the HPE Support Center website under SKU 684208-B21.
What exactly is included in the 684208-B21 package?
The package contains the HPE 1GbE 4P 331FLR FIO Adapter, a quick install guide, an EMI gasket and a warranty statement.