While not theoretically impossible it’s impractical and unheard of for multiple trusted independent audit companies to be commissioned on an extremely regular basis.
Trustable proprietary software is like nuclear fusion as an energy source. Theoretically possible, but we sure as shit don’t have it.
I know people meme about “Zen 5%” (sidenote: genuinely a clever quip), but most of that is down to AMD massively reducing the power draw of the chips.
If you set it to the same power limits as Zen4, you can get large performance improvements.
Gamers have been saying for years that stuff is getting too power-hungry, but when steps were made to reverse this, they collectively lost their minds.
Seriously, what are they expecting, a 25% improvement in performance at half the power draw, while staying on a 5nm-family node?
AMD were dumb for thinking gamers give even the slightest fuck about power usage. Gamers would much more readily accept a CPU going from 120W to 500W if it meant an imaginary +20% perf uplift over a CPU going from 120W to 70W with a +5% perf uplift. I say imaginary because nobody with a high end CPU and a 4090 actually plays their games at 1080p low.