How is the performance difference between using a dedicated GPU from Nvidia for example compared to whatever Apple does?

So lets say we'd run a model on a Mac Mini M4 with 24GB RAM, how many tokens/s are you getting? Then if we run the exact same model but with a RTX 3090ti for example, how many tokens/s are you getting?

Do these comparisons exist somewhere online already? I understand it's possible to run the model on Apple hardware today, with the unified memory, but how fast is that really?