This article covers IO CREST クアッド2.5ギガビットイーサネット PCI Express PCI-E ネットワークインターフェースカード 10.

Overview

The IO CREST SI-PEX24077 is a PCI Express network interface card that packs four independent 2.5 Gigabit Ethernet ports onto a single board. Powered by the Realtek RTL8125 chipset, each port supports 10/100/1000/2500 Mbps, making it a straightforward upgrade path from standard Gigabit (1 Gbps) to 2.5 Gbps without replacing existing Cat5e cabling. What sets this card apart is its quad-port design. Instead of a single high-speed link, you get four separate 2.5 Gbps connections, ideal for NAS servers, multi-client workstations, or homelab environments where link aggregation or network segmentation is needed. The card uses a PCI Express x4 interface and works in x8 or x16 slots as well. A low-profile bracket is included for compact cases and 1U servers.

Connectivity & Compatibility

Interface: PCI Express x4 (compatible with x8/x16 slots) Supported OS: Windows 10/8.1/8/7/Vista/XP, Linux, macOS 10.7+ Standards: IEEE 802.3, 802.3u, 802.3ab, 802.3bz (2.5GBASE-T) Cable: Cat5e or higher recommended for 2.5 Gbps operation * Important: Does NOT work in legacy PCI slots; PCI Express only

Product Info

The IO CREST SI-PEX24077 sits in the mid-to-high-end segment of network expansion cards. Quad-port 2.5 GbE cards are still relatively rare, and this model offers a compelling price-to-port ratio. Release: Around 2022 Price: Approximately ¥17,000 on Warranty: 3-year Syba warranty with lifetime customer support Accessories: Card, driver disc, low-profile bracket (8 cm) * Availability: , select PC parts retailers Market positioning: While more expensive than entry-level USB 2.5 GbE adapters, no consumer motherboard offers four built-in 2.5 GbE ports. For users who need multiple high-speed wired connections, this card delivers excellent value.

Best Use Cases

NAS / file server operators: Eliminate bandwidth bottlenecks when multiple clients access the same storage simultaneously. With four ports, you can also configure link aggregation for up to 10 Gbps theoretical throughput. Video editors and creative professionals: Paired with a 2.5 GbE switch and NAS, transfer 4K/8K footage roughly 2.5x faster than Gigabit. The quad ports allow simultaneous ingest from multiple cameras or workstations. Advanced home lab users: Physically separate networks for different purposes — for example, dedicate one port to a secure work LAN, another to a guest network, and a third to IoT devices — all without extra switches. Not ideal for: Users who only need a single 2.5 GbE port, or laptop owners without a free PCIe slot. In those cases, a USB 2.5 GbE adapter is more practical.

Things to Consider

Slot requirements: The card needs at least a PCI Express x4 slot. While it will work in PCIe 2.0 slots, bandwidth may be limited when all four ports are under heavy load. PCIe 3.0 x4 or higher is recommended for full utilization. Driver availability: The included disc covers Windows only. For Linux and macOS, download the latest drivers from Realtek's official site. macOS support is listed as 10.7+, but compatibility with newer macOS versions (Ventura and later) should be verified beforehand. Heat management: Four 2.5 GbE controllers generate noticeable heat under load. The card comes with a heatsink, but good case airflow is still important. In tightly sealed cases, consider active cooling nearby. Alternatives: Single-port 10 GbE cards like the ASUS XG-C100C or TP-Link TX401 offer higher per-port speed but lack multi-port flexibility. If you only need one fast link, a single-port 2.5 GbE card is cheaper. For multi-port needs, the SI-PEX24077 is hard to beat at this price.

Product Disclosure (Amazon)

  • Manufacturer: IO Crest
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B09SS8GVHC
  • Note: This article covers a manufacturer-made product based on Amazon listing details.