Product Overview

The Buffalo LGY-PCIE-MG2 is a PCI Express LAN card supporting 10GBASE-T. By installing it into a desktop PC, you can achieve wired network speeds of up to 10 Gbps — ten times faster than standard Gigabit Ethernet. This makes it ideal for large file transfers, NAS access, and creative workflows that demand high bandwidth.

Manufactured by Buffalo Inc., this model (LGY-PCIE-MG2, ASIN B08V4SGHGF) is widely available through Amazon.co.jp and other retailers.

Key Features

  • 10GBASE-T support: Single RJ-45 port with auto-negotiation for 10G/5G/2.5G/1G/100 Mbps. Works with existing Cat 6a or higher cabling.
  • PCI Express 3.0 x4 interface: Provides sufficient bandwidth for full 10 Gbps throughput.
  • Low-profile bracket included: Comes with both standard and low-profile brackets for flexible installation in compact cases.
  • Low power consumption: Approximately 4.5W under load, keeping heat and energy use minimal.
  • Buffalo utility software: Manage link status and power-saving settings with the included tool.

Compatibility Guide

  • Slot requirement: A PCI Express x4 or larger slot is needed. An x16 slot works, but an x1 slot will bottleneck performance.
  • OS support: Windows 10 / 11 (64-bit), Windows Server 2019 / 2022. Linux is not officially supported, but the Marvell AQtion controller may work with community drivers.
  • Form factor: Standard ATX and low-profile brackets included. Fits most desktop cases.
  • Network environment: To achieve 10 Gbps, you need a compatible switch, NAS, and Cat 6a or better cabling. The card will automatically step down to lower speeds in a 1 Gbps network.

Ideal Use Cases

  • Home or small office users running a NAS who want to eliminate file transfer bottlenecks.
  • Video editors and creative professionals handling large files regularly.
  • Anyone upgrading from Gigabit Ethernet to 10GbE for future-proofing.
  • Gamers seeking stable, low-latency wired connections (though most games don't require more than 1 Gbps).

Upgrade Considerations

  • Factor in the cost of a 10GbE switch and compatible NAS — the card alone won't improve speed without supporting infrastructure.
  • If your motherboard's PCIe slot is version 2.0 or older, bandwidth may be insufficient for full 10 Gbps. Check your motherboard specs.
  • Heat is low, but ensure adequate airflow in the case to keep the heatsink clean.
  • Drivers are available via Windows Update, but downloading the latest from Buffalo's official site is recommended for best stability.

Product Disclosure (Amazon)

  • Manufacturer: バッファロー
  • Seller: ティーズオンラインショップ
  • Fulfilled by: Amazon
  • Model: LGY-PCIE-MG2
  • ASIN: B08V4SGHGF
  • Note: This article covers a manufacturer-made product based on Amazon listing details.