720/2=360; 1440/2=720 Basically what they do is take a 2x2 square of hardware pixels and treat it like 1x1 pixel in software. It's like scaling up a picture in a picture viewer by x2 of if you drive your 1920x1080 monitor with only 960x540. The resulting image will still be crisp, because your scaled image will still exactly match the display's pixels, but it will be "blocky".