WereKitten on 30 April 2009
^Uhm, actually with a fixed aspect ratio of say 16/10:
1080p = 2.25 x 720p = 2.25 x 2.25 x 480p (in pixel count)
But that's before compression, and only for raw video data, so it's not an exact multiplier you can use for a mixed content like a game that is made of code, textures, audio, geometry data, videos etc.
