Swiss 576p forcing not working in Metroid prime (GameCube)

[andykara2003]

I’m using Swiss on a US GameCube (using action replay and SD card) and a PAL copy of Metroid prime (actual retail disk). I force 576p and comparing the result to running the NTSC version at 480p, there doesn’t seem to be any difference in resolution on screen.

Metroid prime should be the one game from my PAL collection that benefits from 576p forcing as it has an internal resolution of more than 640x480. Am I neglecting another setting or missing something? I understand it should be running in 50hz mode for 576p forcing, which I am doing.