--- product_id: 155464483 title: "SI-PEX24059" brand: "io crest" price: "Β£17.50" currency: GBP in_stock: true reviews_count: 10 category: "Io Crest" url: https://www.desertcart.co.uk/products/155464483-si-pex24059 store_origin: GB region: Great Britain --- # 2.5 Gbps blazing speed Universal PCIe x1-x16 compatibility Low-profile bracket for compact builds SI-PEX24059 **Brand:** io crest **Price:** Β£17.50 **Availability:** βœ… In Stock ## Summary > πŸš€ Upgrade your network, outrun the rest! ## Quick Answers - **What is this?** SI-PEX24059 by io crest - **How much does it cost?** Β£17.50 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/155464483-si-pex24059) ## Best For - io crest enthusiasts ## Why This Product - Trusted io crest brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Blazing 2.5 Gigabit Speed:** Experience lightning-fast Ethernet connectivity up to 2.5 Gbpsβ€”perfect for seamless streaming, gaming, and remote work. - β€’ **Cross-Platform Powerhouse:** Compatible with Windows, Mac OS, Linux, and moreβ€”future-proof your network with broad OS support. - β€’ **Compact & Customizable Fit:** Includes both standard and low-profile brackets to ensure sleek installation in full-size towers or space-saving HTPC cases. - β€’ **Plug & Play PCIe Versatility:** Fits any PCI Express slot (x1 to x16), making upgrades effortless across desktops, workstations, and servers. - β€’ **Enterprise-Grade VLAN Support:** Built-in 802.1Q VLAN tagging for secure, segmented networkingβ€”ideal for professionals managing complex environments. ## Overview The IO Crest SI-PEX24059 is a high-performance 2.5 Gigabit Ethernet PCIe network card designed to deliver ultra-fast, reliable wired connectivity. Compatible with a wide range of PCI Express slots and operating systems, it includes both standard and low-profile brackets for versatile installation. Perfect for professionals seeking to future-proof their desktop or server networking with enterprise-grade VLAN support and hassle-free plug-and-play setup. ## Description Provides 2.5 Gigabit Ethernet connectivity to Mac Pro towers and Windows PCs. Simple way to add or expand 2.5 Gigabit Ethernet connectivity to any compatible computer. It is suitable for multiple market segments and emerging applications, such as desktop, mobile, workstation, server, communications platforms, and embedded applications. Review: Gets HOT, but pulls data at 10GbE. Requires Thunderbolt, not just USB 4! - Have not used it for extended periods of time, but seems to work correctly when combined with a USB4 or Thunderbolt4 port. It does get HOT, so don't put anything on top of it. Windows 11 driver worked just fine out of the box, but I did tweak some settings. I do this on all my Ethernet adapters. If your USB4 port is not also Thunderbolt, this device will not show up as a network adapter. It uses the Aquantia chip. It will show up as a USB device with no function. Review: Is revision 03, but be wary of Linux/BSD use - Edit: as of XigmaNAS 13.1.0.5.9725 this adapter is now recognized and works as-expected! Thanks to ms49434 and zoon01 for applying a kernel patch to accept the PHY that is present. Original review follows. The adapter arrived in a small, cardboard box. The heatsink is attached securely. A hardware check indicates that the chip is revision 03. Under Windows 10/11, the adapter is usable with no additional effort or configuration on the user's side. Under Linux/FreeBSD, the adapter may or may not work depending on the version of the driver used to attempt init. Under FreeBSD specifically, support for the I225 was added in 13.1 via πš’πšπšŒ, however the driver performs an unnecessary PHY vendor ID check, which may fail if the adapter reports an ID that isn't listed in an internal table. The fix (recommended by Intel themselves) is to no longer perform this check and instead assume a PHY for all I225 adapters. This fix is available in FreeBSD 13.2 and/or 14, and would need to be backported if using anything earlier. Examples; TrueNAS Scale 22.12.0 supports this adapter, while XigmaNAS 13.1.0.5.9687 (latest as of this review) includes πš’πšπšŒ, but fails to init with the adapter I received. ## Features - With this PCIe Card, you can add a 10/100/1000/25000 Mbps Ethernet port to any PC through a PCIe slot.Fits any PCI Express x1, x2, x4, x8 or x16 socket; additional 8cm low-profile bracket provides the option for installation in small size HTPC case. - This pci-based 10/100/1000/25000 2.5 Gigabit Ethernet network adapter card provides a simple connection to a 2.5 Gigabit Ethernet network, and is fully compatible with 802.1Q virtual LAN (VLAN) tag. And Ethernet card which Is compliant to IEEE802.3, IEEE802.3U & IEEE802.3ab. - The high quality PCIe 2.5 Gigabit NIC with 12cm profile bracket and additional 8cm profile bracket that makes it easy to install the card in a small form Factor/Low profile computer case/server. - Gigabit network card compatible with a broad range of operating systems, including Windows 10, 8/8.1, 98SE, ME, 2000, XP, xp-64bit, Vista, vista-64bit, 7, 7-64 Bit, Linux, Mac OS 10.7 - What you get: IO crest 2.5 Gigabit PCI-E network card x1, driver Disk x1, 8cm low-profile bracket x1. Backed by IO crest 3 Year hassle-free warranty and lifetime customer service. Important Note: only work with PCI-E slot, not for PCI slot. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07RF4SZ8R | | Best Sellers Rank | #70 in Internal Computer Networking Cards | | Customer Reviews | 3.9 3.9 out of 5 stars (1,097) | | Date First Available | May 2, 2019 | | Item Weight | 3.2 ounces | | Item model number | SI-PEX24059 | | Manufacturer | I/O Crest | | Product Dimensions | 4.3 x 0.5 x 5.5 inches; 3.2 ounces | | Release date | May 2, 2019 | | Type of item | Personal Computers | ## Product Details - **Brand:** IO CREST - **Hardware Interface:** Ethernet, PCI, PCI Express x1 - **Color:** multicolor - **Compatible Devices:** Desktop - **Product Dimensions:** 4.3"L x 0.5"W x 5.5"H - **Data Link Protocol:** IEEE 802.3 - **Data Transfer Rate:** 2.5 Gigabits Per Second - **Item Weight:** 0.2 Pounds - **UPC:** 857426008260 - **Global Trade Identification Number:** 00857426008260 ## Images ![SI-PEX24059 - Image 1](https://m.media-amazon.com/images/I/71lsMMrdhqL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Gets HOT, but pulls data at 10GbE. Requires Thunderbolt, not just USB 4! *by T***Y on June 22, 2025* Have not used it for extended periods of time, but seems to work correctly when combined with a USB4 or Thunderbolt4 port. It does get HOT, so don't put anything on top of it. Windows 11 driver worked just fine out of the box, but I did tweak some settings. I do this on all my Ethernet adapters. If your USB4 port is not also Thunderbolt, this device will not show up as a network adapter. It uses the Aquantia chip. It will show up as a USB device with no function. ### ⭐⭐⭐⭐⭐ Is revision 03, but be wary of Linux/BSD use *by E***Y on February 25, 2023* Edit: as of XigmaNAS 13.1.0.5.9725 this adapter is now recognized and works as-expected! Thanks to ms49434 and zoon01 for applying a kernel patch to accept the PHY that is present. Original review follows. The adapter arrived in a small, cardboard box. The heatsink is attached securely. A hardware check indicates that the chip is revision 03. Under Windows 10/11, the adapter is usable with no additional effort or configuration on the user's side. Under Linux/FreeBSD, the adapter may or may not work depending on the version of the driver used to attempt init. Under FreeBSD specifically, support for the I225 was added in 13.1 via πš’πšπšŒ, however the driver performs an unnecessary PHY vendor ID check, which may fail if the adapter reports an ID that isn't listed in an internal table. The fix (recommended by Intel themselves) is to no longer perform this check and instead assume a PHY for all I225 adapters. This fix is available in FreeBSD 13.2 and/or 14, and would need to be backported if using anything earlier. Examples; TrueNAS Scale 22.12.0 supports this adapter, while XigmaNAS 13.1.0.5.9687 (latest as of this review) includes πš’πšπšŒ, but fails to init with the adapter I received. ### ⭐ Linux/Fast/Stable *by D***N on July 28, 2025* Linux plug and play. Works great on 6x kernels. 600MB/s to and from my TruNAS machine running four Hitachi 10TB platter drives in zraid. Performance is steady and stable. EDIT Nov.25 Updated to 1 star. Less if I could. I've had two of these burn out this year and had to return them. Still recognized as present but fail to connect or get an IP. Real pain too because I have to remove my 4090 bracket to remove the card. Truly happy this works because it's the only x1 card I could find. Most of my board is blocked off by my RTX4090 and brace. Only other exposed slot is x8 but it has a card with 4x m.2 nvme drives on it. EDIT 8/16/2025 The card lasted less than three weeks and died. Does not recognize that a cable is even plugged in. I bought two and the second is working in place of the failed nic. We will see how long that lasts. ## Frequently Bought Together - IO CREST 2.5 Gigabit Ethernet PCI Express PCI-E Network Interface Card 10/100/1000/25000 Mbps RJ45 LAN SI-PEX24059 - TP-Link 2.5GB PCIe Network Card (TX201) – PCIe to 2.5 Gigabit Ethernet Network Adapter, Supports Windows 11/10/8.1/8/7, Win Server 2022/2019/2016, Linux - Cable Matters 10Gbps Snagless Shielded Cat 6A Ethernet Cable - 14ft, Cat 6A Cable, Cat6A Cord, Ethernet Cord, Black --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/155464483-si-pex24059](https://www.desertcart.co.uk/products/155464483-si-pex24059) --- *Product available on Desertcart Great Britain* *Store origin: GB* *Last updated: 2026-04-27*