This article covers 2.5GB PCI-E ネットワークカード NIC (RTL8125) チップセット-RJ45 PCIe.

Overview

The DERAPID 2.5GB PCI-E Network Card is an affordable wired LAN adapter built around the Realtek RTL8125 chipset. It supports up to 2.5 Gbps transfer speeds, making it a cost-effective upgrade from standard Gigabit Ethernet (1 Gbps). Simply plug it into a PCI Express x4/x8/x16 slot on your desktop PC to add high-speed wired connectivity.
This card is compatible with a wide range of Windows operating systems, from Windows 11 down to Windows XP and Vista, ensuring it works with older machines as well. Priced around ¥4,500, it offers excellent value for anyone looking to move beyond 1 Gbps without breaking the bank.

Connectivity & Compatibility

The interface is PCI Express, physically fitting into x4, x8, or x16 slots. It uses the Realtek RTL8125 chipset, supporting the 2.5GBASE-T standard over Cat5e or better cabling. The card features a single RJ45 port.
OS support covers Windows 11/10/8.1/8/7/XP/Vista. Drivers are automatically installed via Windows Update or can be downloaded from Realtek's official site. Linux and macOS are not officially supported, though community drivers may work.

Product Info

This product was released around 2024 and is sold exclusively through online retailers. The price is ¥4,581 (as of September 2026), making it one of the cheapest 2.5 Gbps NICs available. The manufacturer provides a standard one-year warranty. The package includes only the card itself; no low-profile bracket is included.
Market positioning is entry to mid-range. While the Realtek RTL8125 is an older chip compared to Intel I225-V, it is known for stability and broad compatibility, appealing to budget-conscious users.

Best Use Cases

  • NAS or file server users: Pairing this card with a 2.5 Gbps NAS and switch can dramatically speed up large file transfers, offering about 2.5x the throughput of Gigabit Ethernet. However, the benefit is limited if the NAS or switch only supports 1 Gbps.
  • Users wanting to add fast wired LAN to an older PC: If your motherboard lacks a 2.5 Gbps port, this card provides an easy upgrade. It works well with older chipsets like B460 or H410. Be aware that PCIe slot bandwidth limitations may cap performance on very old platforms.
  • Budget-conscious DIY builders: At under ¥5,000, this card is significantly cheaper than Intel-based alternatives. It's ideal for building a cost-effective 2.5 Gbps network. Note that under heavy load, CPU usage may be slightly higher than with Intel chips, so it's less suitable for high-performance servers.

Product Disclosure (Amazon)

  • Manufacturer: DERAPID
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B0DMDXN6XL
  • Note: This article covers a manufacturer-made product based on Amazon listing details.