7800xt uses 250 watts. They will need to shave almost 100 off to fit in the power envelope of a console. How are you proposing this will be done without a drop in performance?
The only way this can happen is if Sony buy's up a lot of 3nm space or if they just put a 7900xtx in the original ps5 casing and have it plug into a ps5 slim and that combined becomes voltron..... errr the ps5 pro