when i did see a lot of intro and on tv the graphics looks amazing but when you play it it does not looks soo good

and its saying that you need a card that have 4 gb to play on ultra i have 3 gb and i play on the highest setting no problem strange + 1080 also

and how come that this game need 4 gb vram when i have 3 gb vram i dont have a problem that really strange???