I'm not technical enough to explain why, other than to know graphics are processed differently than other compute functions, and as a result are better suited for AI.
The more powerful the GPU, and the more of them, the better AI performs (obviously, "more is better" applies.)
I'm trusting someone else with a better understanding will come along and answer your question better than I can.
Thank You for your response to my question. Please do not disparage your knowledge for IF a rock and myself were placed side by side and gaged for knowledge ….. the rock would be more knowledgeable than me.