The eGPU market exploded with the introduction of Thunderbolt 3. I have used a number of solutions both with my XPS 13 and Alienware 15 notebooks along with testing done via the ThunderboltEX3 AIC with our desktop test platform. In the past eGPU platforms consisted of a rather large enclosure hovering around the size an ITX chassis, paired with an SFX power supply and Thunderbolt 3 to PCIe interface. This platform is very customizable with many vendors having a solution to fit your needs with that added bonus that you can choose any PCIe GPU you want and install it.