eGPUs do work, but they come with some notable limitations

External GPUs (eGPUs) offer a way to boost the graphical performance of laptops by connecting a desktop-class graphics card via Thunderbolt or similar high-speed interfaces. While they provide a path for users to turn portable machines into gaming or creative powerhouses, they are often hindered by significant bottlenecks. Data transfer speeds through external cables cannot match the bandwidth of a direct PCIe slot on a motherboard, leading to performance degradation. Additionally, compatibility issues, driver conflicts, and the high cost of enclosures often make the setup less efficient than intended. For many users, the investment required for an eGPU setup—including the enclosure and the graphics card itself—is better spent on a dedicated gaming PC. While the technology serves a specific niche, it remains a complex and often suboptimal solution for those seeking reliable, high-end graphical performance.