The article discusses the possibility of using an NVIDIA RTX 5090 GPU with an M4 MacBook Air via a Thunderbolt eGPU setup. The author explores the technical challenges and limitations of this setup, including the lack of NVIDIA drivers for Apple Silicon and the need for PCI passthrough on macOS. The author successfully runs Linux in a virtual machine on the MacBook Air and passes through the GPU, allowing for gaming and AI inference. However, the performance is not perfect due to various technical limitations.