HP Ethernet 1Gb 4-Port 331T Adapter - High Density 1Gb Networking

In this review the HP Ethernet 1Gb 4-Port 331T Adapter is presented as a practical, cost-conscious network card for servers and workstations that need reliable four-port 1Gb connectivity. The bottom line: it is for IT professionals and small datacenter operators who prioritize port density and low power use over fancy extras. The review finds that the adapter delivers full line-rate throughput across four ports with modest power draw, and its single-chip design helps conserve I/O slots and simplify deployments while keeping acquisition cost attractive.

Key Features

• Quad 1Gb Ports: Provides a total aggregate throughput of 4Gb to meet high bandwidth needs across multiple virtual machines or consolidated services.
• Single-chip Integration: Reduces power requirements and frees up system resources by combining Ethernet functions on a single, efficient chip.
• Low Power Consumption: Runs cooler and uses less energy than older multi-chip designs, helping lower operating costs in densely populated racks.
• Advanced Offload: Supports Large Send/Receive offload and TCP checksum/segmentation to reduce CPU load during heavy network transfers.
• Virtualization Friendly: Designed for server consolidation and segmentation, making it suitable for virtual machine hosts and security appliances.
• Jumbo Frame & IEEE 1588 Support: Offers options for higher throughput and precise timing where network performance and synchronization matter.

Who It's For

This adapter is aimed at systems administrators, small datacenter operators, and IT teams running virtualization, security appliances, or consolidated servers that need reliable, four-port 1Gb connectivity without a high price tag. It fits well in PCI Express x4 slots that require a compact, efficient network card with good throughput and offload capability.

Users who need multi-gigabit speeds, integrated fiber optics, or advanced vendor-specific management features should look elsewhere. Home users who only need one port or casual file sharing may find this card overkill for their needs.

Pros & Cons

Pros

• High port density with four full line-rate 1Gb ports for consolidated systems.
• Energy-efficient single-chip design that reduces power draw and slot usage.
• Useful offload features like Large Send/Receive and TCP checksum/segmentation to lower CPU overhead.
• Practical feature set for virtualization, network segmentation, and server consolidation.

Cons

• Limited to 1Gb speeds per port, so it is not suitable where multi-gig or 10Gb is required.

Specifications

Brand	HP
Model	331T
Form Factor	Standup
Host Interface	PCI Express x4
Network Technology	10/100/1000Base-T (1Gb per port)
Total Aggregate Throughput	4Gb

Our Verdict

The HP Ethernet 1Gb 4-Port 331T Adapter is a sensible, value-oriented choice for administrators who need reliable four-port 1Gb connectivity with low power draw and practical offload features. It is especially good for virtualization hosts and server consolidation where port density and efficiency matter, but it is not the right pick when higher-than-1Gb speeds are required.

Frequently Asked Questions

Does this adapter support jumbo frames?
Yes. The adapter supports jumbo frames, which can help improve throughput for large transfers.

What slot does it require?
The card uses a PCI Express x4 host interface and will fit in an x4 or larger PCIe slot.

Is it suitable for virtualization hosts?
Yes. The adapter is designed for virtualization, server consolidation, and offers offload features to reduce CPU load.