It's not a meter of resolution .
As far I know you can run " TEXTURES " up to 4096x2048 px for every layer . So 14 4096x2048 textures .
This does not mean that you can play 14 x 4096x2048 movies .
I don't think there is a improvement of performance by using NVidea 4500 .
So as far I know , there are no advantage .