SMUGDESK Dual 2.5G RJ45 PCIe x1 Network Card

Dual 2.5G RJ45 PCIe x1 Network Card

The SMUGDESK Dual 2.5G RJ45 PCIe x1 Network Card adds two independent 2.5Gbps Ethernet ports to a desktop PC through a single PCIe x1 slot. It targets users who need faster wired links for NAS access, large file transfers or replacing a failed onboard LAN port without occupying a larger expansion slot.

Practical limits of the PCIe x1 interface

The card uses a PCIe x1 connection that fits x1, x4, x8 or x16 slots, but the single-lane bandwidth caps total throughput below the combined 5Gbps theoretical maximum of both ports running at 2500Mbps simultaneously. Real-world speeds also depend on the switch, cabling quality and system CPU load during heavy traffic.

Realtek RTL8125BG chip with dual RJ45 ports

The Realtek RTL8125BG controller drives two physical RJ45 ports that auto-negotiate 2.5Gbps, 1Gbps, 100Mbps or 10Mbps over Cat5e or Cat6 wiring. This single chip determines whether the card matches a build needing two separate 2.5G links for link aggregation or segregated traffic, versus a single-port alternative.