Wisd Pi's new 10G Ethernet Expansion Card for Framework laptops exposes fundamental USB-C bandwidth complexities that prevent users from achieving advertised speeds. The card uses Realtek's RTL8159 controller, which requires USB 3.2 Gen 2x2 (20 Gbps) to deliver true 10 Gbps performance. However, many Framework laptops fall short due to connection limitations, creating a bottleneck that caps throughput well below expectations.

Testing revealed significant performance gaps across different Framework models. On a Framework 13 with AMD Ryzen AI 5 340, users see roughly 9.4 Gbps maximum under Windows 11, with Linux performing worse despite documentation claiming USB 3.2 Gen 2x2 support. The RTL8159 becomes bottlenecked on USB 3.2 Gen 2x1 connections, limiting speeds to under 8 Gbps. Driver compatibility issues compound the problem—Ubuntu 26.04's newer kernel prevents Realtek driver installation.

Thermal performance presents another concern. Extended testing pushed the module to nearly 70°C on its plastic surface, raising potential Toasted Skin Syndrome risks for users who place laptops on their laps. While Wisd Pi claims compliance with IEC 62368-1 safety limits for brief contact, the heat buildup makes lap use inadvisable. The module also protrudes from the laptop chassis, requiring removal for sleeve storage.

For most users, Wisd Pi's $99 10G card isn't worth the investment. The standard 2.5 Gbps Ethernet Expansion Card at $40 offers better value, while those needing higher speeds should consider external USB-C dongles instead. The hardware illustrates how expansion card designs struggle with thermal and bandwidth constraints in ultraportable form factors.