How much can Ryzen 9 7940HX's performance change between power modes, and when should performance mode be used?

  Power-mode differences on the 7940HX are best judged by testing: run the same task in both modes and compare. Older flagship models usually gain genuinely from performance mode, at the cost of noticeably louder fans.

  Use performance mode for plugged-in gaming and rendering, balanced for office work. If frames don't change in performance mode, check cooling and power-wall settings first.