You have a aib card which will draw significantly more power under load, my MBA 7900xtx with a tuned 7950x pulls around 580w total sustained, granted peak power is more as the MBA alone can hit 520w but that's for a second or 2, my CPU hovers around 90-130w, as for the GPU that is out of box 349w.
Then you are entering the realm of what-if statements...... I can swap it out for another card and get XYZ
It was an example to show peak power draw to highlight how indifferent it can be.