Computer screens are commonly 800 or more pixels wide. The lowest screen display size is 640 x 480 pixels. Most GC computers are set to 1024 X 768. In 2002 the most common screen width earth-wide was about 800 pixels. It appears that 1024 pixels has since edged out 800.. On a PC, right-click on screen background and pick properties to see how many pixels on your screen.