Network adapter HP Enterprise 1Gb Ethernet 4-port 331FLR (server mezzanine/FLR format)

The HP Enterprise 1Gb Ethernet 4-port 331FLR is a low-profile server network adapter that provides four 1 Gigabit Ethernet ports in an FLR/mezzanine form factor. Engineered for compatible HPE server platforms, this adapter enables additional network interfaces without occupying full-height slots, allowing denser configurations in rack and blade systems. The card supports standard Ethernet connectivity for general network access, virtualization traffic separation, and storage networking.

Advantages

This 4-port 1Gb Ethernet adapter delivers compact, predictable network expansion in servers that support the FLR mezzanine form factor. Its low-profile design conserves system space while providing multiple physical interfaces to consolidate traffic and simplify cabling. The adapter is designed for reliable throughput at gigabit speeds and integrates with common server management and network feature sets, making it suitable for environments that require stable, consistent connectivity for virtual machines and storage access.

Suitable for

• Adding multiple 1Gb network interfaces to compatible HPE servers
• Consolidating management, VM, and storage network traffic
• Data center server upgrades and maintenance
• Virtualization platforms requiring separate physical NICs
• Environments needing low-profile mezzanine connectors to save slot space

Key specifications

• Form factor: FLR / mezzanine low-profile
• Ports: 4 × 1 Gigabit Ethernet ports
• Interface type: Server mezzanine connector compatible with supported HPE platforms
• Speed: 1 Gbps per port
• Typical use: Network interface expansion, virtualization and storage traffic support

How to use

Install the adapter into a compatible FLR/mezzanine slot on the server mainboard according to the server manufacturer’s installation guide. After physical installation, power up the server and verify that the system firmware recognizes the device. Install or enable the appropriate network drivers provided by the server or adapter vendor, then configure network settings in the operating system or hypervisor management interface. Assign IP addresses, configure VLANs or teaming as required, and test connectivity at gigabit speeds to ensure correct operation.

Recommendations

Use this adapter in HPE server models that explicitly list FLR/mezzanine compatibility to ensure mechanical and electrical fit. For virtualization and storage tasks, separate traffic across ports or VLANs and consider NIC teaming for redundancy. Keep firmware and drivers up to date to maintain performance and compatibility.