Not trippin. AMD makes a separate "AI Engine" (the part that's supposed to run the models) which is a separate wafer from your GPU's.
https://www.amd.com/en/products/processors/laptop/ryzen/ai-300-series/amd-ryzen-ai-max-385.html
My main reason for mentioning it is that my setup is solar-assisted also, and I also setup my Ai mini-pc (minisforum um890) in gpu-only mode when I got it. It was running at 1/3 speed and using 3x power than it should have on paper.
Anyway not a performance nitpick so much as "I've got one of those new tools too, and I think you're holding it the wrong way"... Like you said, unified systems are new and there's a lot of misconceptions to unlearn (like skeumorphically selecting a gpu-only runtime even when we paid the extra $ for an AI CPU)