Delock 81270 PCI Express x1 Network Card 10 Gigabit LAN 1 x RJ45 RTL8127

Most 10 Gigabit network cards require a PCIe x4 slot and carry a premium price, but the Delock 81270 breaks that mold by delivering full 10GBASE-T performance over a single PCIe x1 lane. Built around the Realtek RTL8127 controller, this card brings 10 Gbps copper connectivity to compact desktops, workstations, and servers that lack larger expansion slots—without sacrificing backward compatibility or essential enterprise features.

Highlights

• 10 Gigabit Ethernet over standard RJ45 copper cabling (Cat6a or better)
• PCI Express x1 form factor fits into any PCIe slot, including x1, x4, x8, or x16
• Realtek RTL8127 chipset ensures reliable, energy-efficient operation
• Backward compatible with 5G, 2.5G, 1G, and 100M networks
• Includes both standard and low-profile brackets for flexible installation
• Supports jumbo frames up to 16 KB for reduced CPU overhead
• Wake-on-LAN and PXE boot ready for remote management

In daily use

Installing the Delock 81270 is straightforward: insert the card into any available PCIe slot, secure it with the appropriate bracket, and install the driver for your operating system. Windows 7 through 11, Windows Server, and mainstream Linux distributions are supported, with macOS compatibility depending on driver availability. Once active, the card negotiates the highest common speed with your switch—whether that's 10 Gbps over Cat6a or a fallback to 5G, 2.5G, 1G, or 100 Mbps on older cabling. The single RJ45 port features an LED indicator for link status and activity, giving you at-a-glance confirmation of connection health.

Full specifications

• Interface: PCI Express x1 (PCIe 2.0/3.0 compatible)
• Network standard: 10GBASE-T (IEEE 802.3an)
• Backward compatibility: 5GBASE-T, 2.5GBASE-T, 1000BASE-T, 100BASE-TX
• Data transfer rates: 100 Mbps, 1 Gbps, 2.5 Gbps, 5 Gbps, 10 Gbps
• Ports: 1 x RJ45
• Chipset: Realtek RTL8127
• IEEE standards: 802.3, 802.3u, 802.3ab, 802.3bz, 802.3an, 802.3x
• Jumbo frame support: up to 16 KB
• Wake-on-LAN: Yes
• PXE boot support: Yes
• Flow control: IEEE 802.3x
• LED indicators: Link/Activity
• Full duplex support: Yes
• Operating systems: Windows 7/8/10/11, Windows Server, Linux, macOS (driver dependent)
• Brackets: Standard and low-profile included

Final note

The Delock 81270 is a smart choice for anyone needing 10 Gigabit Ethernet in a compact system—no x4 slot required.