Budget 10 Gigabit Ethernet adapters based on Realtek's RTL8159 USB 3.2 controller have started appearing on the market, with prices ranging from $45 (€41) to $90 (€83). The RTL8159 chip was unveiled at Computex 2025 alongside the PCIe-based RTL8127 as part of Realtek's push into low-cost, low-power 10GbE solutions.
The WisdPi WP-UT9 measures 5.9 cm (2.3 inches) by 2.9 cm (1.1 inches) by 1.3 cm (0.5 inches) and weighs 58.8 grams (2.1 ounces). It features a single RJ45 10GbE port with backward compatibility down to 10/100Mbps Ethernet, a USB 3.2 Gen 2 Type-C connector, and dual LEDs for link status and activity. The adapter sells for $79 (€73) from WisdPi's website, though shipping and tariffs may increase the final price. The larger XikeStor SKN-U310GT at 9.9 cm (3.9 inches) by 4.2 cm (1.7 inches) by 2.2 cm (0.9 inches) has attracted nearly 200 sales and user reviews report iperf3 transfer rates between 6.5 and 8.6 Gbps depending on the host system and operating system.
Performance varies significantly based on the USB port type. Systems with rare USB 3.2 Gen 2x2 20 Gbps ports can hit near-theoretical maximums, but the more common Thunderbolt and USB4 ports run in compatibility mode. Testing on the budget Lekuo DR59R11 model, available for $45 (€41), showed 7.1 to 7.4 Gbps on USB4 ports, 6.0 Gbps on Thunderbolt 4, and only 3.5 to 3.9 Gbps on Thunderbolt 3 ports. The cheapest model measures 8.4 cm (3.3 inches) by 4.8 cm (1.9 inches) by 2.9 cm (1.1 inches).
All three adapters support Windows, Linux, macOS, and UEFI with drivers available from Realtek's website, though some systems may work out of the box. Linux users running kernel 5.8 or newer can expect plug and play functionality through the r8152 kernel module, though installing Realtek's driver version 2.20.1 or later delivers optimal performance. NAS enthusiasts have already packaged automated builds for QNAP systems, and the adapters work with TrueNAS, UnRAID, and Proxmox. User reports indicate the adapters run cool with surface temperatures around 33°C (91°F) even under load, consistent with Realtek's claimed 2W power consumption under full operation.
