How do you get more GPUs than your motheboard natively supports?

A Reddit user building a personal AI server discovered that consumer motherboards max out at 6 PCIe slots. To connect 8+ GPUs, the community recommends using PCIe riser cables to extend GPUs away from the board and PCIe switches to split one slot into many. This lets enthusiasts assemble powerful, multi-GPU clusters for running large models like Llama 3 or training custom AI, bypassing expensive server hardware with creative, cost-effective solutions.