According to Matt Bach from Puget Systems, the maximum resolution from a modern VGA port is 2,048 by 1,536 pixels at 85 hertz as of 2013. The original VGA port supported 640 by 480 pixels at 60 hertz, but modern ports are enhanced.
Graphics cards, monitors and televisions are limited by the pixel clock, or the speed at which pixels are processed, which is expressed in megahertz. The device with the slowest pixel clock determines the maximum resolution that can be displayed. VGA, first introduced by IBM in 1987, became the analog video standard, but it also refers to the HD15 interface.