For running CodeProject.ai, a dedicated GPU can significantly enhance performance, especially for AI tasks. The GIGABYTE GeForce RTX 3050 OC you mentioned should work well with your HP EliteDesk 800 G3, assuming your PSU supports it and you have sufficient space. Regarding using your Coral USB stick, you can run TensorFlow Lite models efficiently, leveraging your existing setup. If you're primarily focusing on lightweight models or inference tasks, your Coral device might suffice without a dedicated GPU. However, for more intensive training or larger models, upgrading with the RTX 3050 would be beneficial.