Here’s some footage of 8 games running on a GameCube using the GCHD Mk-II (which lets you output in HDMI).
For the full written review, visit https://tiredoldhack.com/2019/02/20/gchd-mk-ii-gamecube-review/.
All of these games were captured on a PAL GameCube, with each game set to its 50Hz mode.
For part one, which looks at games running in 60Hz mode, visit https://youtu.be/dBwwxgmKgX0