That's just nonsense! The game simply cannot display more than what the graphics card can render, and there might be small (microscopic) inaccuracies related to the pixel density of the screen. This isn't like a movie, which can be filmed in a higher resolution and then compressed for release, only to be re-released in IMAX later.
I reread my comment and realized that it implies the game displays more than the graphics card is capable of. That's truly absurd.