Used Network Cards for Server

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Server Network Cards – Used & Refurbished PCI-E, Mezzanine & LOM Network Adapters

Looking for high-performance server network cards? We offer a wide range of **used and refurbished** PCIe, mezzanine, and onboard network adapters for servers. Whether you need **RJ45, SFP+, or InfiniBand interfaces**, our selection ensures optimal networking speed, stability, and compatibility for your infrastructure.

Why Do Servers Need High-Performance Network Cards?

Unlike standard desktop network cards, **server-grade network adapters** provide:

  • Higher bandwidth – Supporting 1G, 10G, 25G, 40G, and even 100G speeds
  • Advanced offloading features – Reduce CPU load and optimize network performance
  • Reliability and redundancy – Essential for high-availability environments
  • Support for virtualization – Including SR-IOV, VXLAN, and RDMA for efficient data flow


Types of Network Cards Available

Our range includes:

  • PCIe Network Cards – Installed in PCI Express slots for maximum compatibility
  • Mezzanine Network Cards – Custom-fit adapters for specific server architectures
  • LOM (LAN on Motherboard) Adapters – Integrated solutions for onboard networking

Network Interfaces & Their Differences


🔹 RJ45 Ethernet Network Cards (1G/10G/25G/40G)

RJ45-based network adapters use standard twisted-pair cabling (Cat5e, Cat6, Cat7) and support speeds from **1Gbps to 40Gbps**. They are ideal for traditional Ethernet-based infrastructure.

✅ Advantages:
  • Uses standard Ethernet cables
  • Easy integration into existing networks
  • Supports Power over Ethernet (PoE) on some models

🔹 SFP & SFP+ Network Cards (10G/25G/40G/100G)

SFP (Small Form-Factor Pluggable) and SFP+ adapters support high-speed fiber optic and copper connections for **low-latency networking**. They use **hot-swappable transceivers**, making them highly flexible.

✅ Advantages:
  • Supports both copper (Direct Attach Copper, DAC) and fiber (optical transceivers)
  • Better latency and higher bandwidth compared to RJ45
  • Lower power consumption

🔹 InfiniBand Network Cards (40G/56G/100G)

InfiniBand adapters are designed for high-performance computing (HPC), AI, and data center applications, providing **ultra-low latency and high throughput**.

✅ Advantages:
  • Higher speeds than traditional Ethernet (up to 200Gbps in latest versions)
  • Ideal for clustering, deep learning, and AI workloads
  • Supports Remote Direct Memory Access (RDMA) for high-efficiency data transfer

Common Networking Protocols & Features

🔹 TCP/IP (Ethernet)

The backbone of most modern networks, supporting **standard Ethernet communication** over RJ45 and SFP-based interfaces.

🔹 RDMA (Remote Direct Memory Access)

Used in InfiniBand and advanced Ethernet solutions to **reduce CPU overhead and latency** by enabling direct memory access between servers.

🔹 VXLAN (Virtual Extensible LAN)

Common in **virtualized environments**, VXLAN allows for **network segmentation** over large-scale data centers.

Frequently Asked Questions (FAQ)

🔹 What is the difference between PCIe and mezzanine network cards?

PCIe network cards are standard adapters that fit into PCI Express slots and can be used in most servers. Mezzanine cards, on the other hand, are designed for **specific server models**, often providing direct integration with the motherboard or chassis.

🔹 Can I upgrade my server from 1G to 10G networking?

Yes! Most servers with available **PCIe slots** or **SFP+ ports** can be upgraded to **10Gbps or higher speeds** by installing a compatible network adapter.

🔹 Is InfiniBand better than Ethernet?

For **standard enterprise networking**, Ethernet is the best choice due to **widespread compatibility**. However, for **high-performance computing (HPC) and AI workloads**, InfiniBand provides **superior latency and bandwidth**.

🔹 What cables do I need for SFP+ network cards?

SFP+ cards require either DAC (Direct Attach Copper) cables for short-distance connections or **fiber optic cables** with compatible SFP+ transceivers for longer distances.

🔹 What warranty do used network cards come with?

All of our **refurbished network adapters** come with a warranty. Please check individual product listings for details.

Buy Used & Refurbished Network Cards for Your Server

Upgrade your server infrastructure with high-quality used and refurbished network adapters. Whether you need **RJ45 Ethernet, SFP+ fiber networking, or ultra-fast InfiniBand**, we provide tested and certified **PCIe, mezzanine, and LOM network cards** at unbeatable prices. Browse our inventory and order today!