I built a computer you plug into your graphics card: https://www.youtube.com/watch?v=l9dItRUjQ0k
And here's a blog post, for the more text-inclined: https://www.jeffgeerling.com/blog/2023/i-built-special-pcie-card-test-gpus-on-pi
Gregory's Server
And here's a blog post, for the more text-inclined: https://www.jeffgeerling.com/blog/2023/i-built-special-pcie-card-test-gpus-on-pi