In today’s AI-driven world, the ability to train AI models locally and perform fast inference on GPUs at an optimal cost is more important than ever. Building your own GPU server with an RTX 4090 or RTX 5090 — like the one described here — enables a high-performance eight-GPU setup running on PCIe 5.0 with full x16 lanes. This configuration ensures maximum interconnect speed for all eight GPUs. In contrast, most similar setups are limited by the PCIe bus version (such as PCIe 4.0 or even lower), due to the challenges of running longer PCIe extensions.