This article covers Buacoz 2.5G デュアルポート ギガビットネットワークカード Intel I225チップLAN NICカード付き 2500M ギガビット デュアル RJ45 ポート イーサネットサーバーアダプター Windows 11.

Overview

The Buacoz 2.5G Dual Port Network Card brings Intel's I225-V chipset to a compact PCIe 3.1 x1 form factor. Each of the two RJ45 ports independently supports speeds up to 2.5 Gbps, offering a 2.5x bandwidth boost over standard Gigabit Ethernet. This makes it an ideal upgrade for home servers, NAS systems, and small office environments where 1 GbE is no longer sufficient. The card includes both full-height (12 cm) and half-height (8 cm) brackets, fitting standard desktop cases as well as slim chassis. Driver support covers Windows 10/11 and Windows Server 2022, with Intel's official drivers ensuring stability.

Connectivity & Compatibility

The NIC uses a PCI Express 3.1 x1 interface, but can be installed in x4, x8, or x16 slots. Each port auto-negotiates 10/100/1000/2500 Mbps speeds and supports full/half duplex. Advanced features include PXE boot, VLAN tagging, flow control, and soft routing. The Intel I225-V chipset offers broad compatibility and mature driver support. However, some users have reported occasional link stability issues with this chipset; keeping drivers and firmware up to date is recommended.

Product Info

Available since around 2024 on Japanese online retailers, this card occupies the entry-to-midrange segment of the 2.5G NIC market. Its street price is approximately ¥9,500, making it one of the most affordable dual-port 2.5G options. The package includes the NIC, full-height and half-height brackets, and a quick-start guide. Warranty is provided by the seller (online retailers's standard 30-day return policy). For extended coverage, consider purchasing an additional warranty plan.

Best Use Cases

  • Home server and NAS users: Pair with a 2.5G switch and compatible NAS for significantly faster file transfer speeds. Dual ports allow link aggregation or failover for increased reliability.
  • Virtualization hosts: Supports VMware and Hyper-V environments. Use one port for management traffic and the other for storage or VM traffic to reduce bottlenecks.
  • Budget-conscious upgraders: At under ¥10,000, this card is an affordable entry point to 2.5G networking. Upgrade one device at a time without replacing your entire network infrastructure.
  • Not suitable for: Environments demanding 10 Gbps or higher. Also, if you're wary of Intel I225-V's known link drop issues (especially with certain switches), consider Realtek-based alternatives.

Product Disclosure (Amazon)

  • Manufacturer: Buacoz
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B0D83JKM38
  • Note: This article covers a manufacturer-made product based on Amazon listing details.