Record game at native, not displayed resolution

[EpicLPer]

Heya there guys!

Is there any way to record a game in its native resolution and not the one the window/fullscreen is showing?

As example I've set Super Mario Galaxy to 4K rendered resolution and I also want to record in that. However I only have up to 1080p screens here and dumping the frames also only results in the actual size of the game window on the screen.

Thanks already!