How much can Core i7 12850HX's performance change between power modes, and when should performance mode be used?

  Test it yourself: run one task for 10 minutes and log CPU power and clocks. The 55W-class base is the dividing line for the 12850HX — if performance mode sustains it, long tasks show a real gap; if not, the chassis just can't do it.

  Plugged in and working? Performance mode. Unplugged office work? Balanced plus hybrid graphics. Mode names in vendor software don't change the data — judge by power and clocks.