Question isn't wattage it runs for, but frequency
Gpu can be limited by 3 things
Power limit = frequency goes down, power and load is maxed out
Frequency limit = frequency and load capped, power isn't maxed.
Engine / CPU limit / unoptimized / bad power management etc = Nothing gets maxed out (in case of CPU limit, CPU thread gets capped)\
I can even show you examples all 3 in exactly same game without even changing graphical settings.
1) power limit showcase
2) Frequency limit
3) Engine limit
To be fair abnormalities can exist. If you aren't limited by anything (engine supposedly) and you overlay something like calculator on top of game and it gets much higher fps with higher frequency - it means there is something fishy going on. But it still will be hard to tell what specifically