Hi, I had a question that maybe you all could answer. As we all know, the new Macbook Pro with Retina display is advertised as 2880x1800, but displays 1440x900, clearer. So I'm wondering, if I'm searching for a nice and clear high resolution wallpaper, should I download it in 2880x1800 or 1440x900? Does it matter? What is the difference? Thanks!