Mostgames don't support a specific ratio. They are rendering the graphics for output which means the visual stuff on screen is being produced real-time. So that's why we need a powerful GPU to handle this job. While 16:10 ratio does have more pixels to render than 16:9 by around 10%, so more burden on GPU should be expected. true.
480pis the shorthand name for a family of video display resolutions.The p stands for progressive scan, i.e. non-interlaced.The 480 denotes a vertical resolution of 480 pixels, usually with a horizontal resolution of 640 pixels and 4:3 aspect ratio (480 × 4 ⁄ 3 = 640) or a horizontal resolution of 854 (848 should be used for mod16 compatibility) pixels for an m5AA.