When the running application to create an image, the application will ask for help on graphics card drivers. Graphics driver will listen to instructions, either from the OS or the application, then take the necessary digital data and converts it into a format understood by the graphics card.

After that, the drivers deliver a new digital data is formatted to the graphics card to do rendering. The data is run through a VGA card into the slot on the motherboard (AGP / PCI-E) Once distributed to the graphics card, the data will be sent to the graphics card memory as a temporary storage place. Then the GPU will take the digital data and convert it into pixels.

At this point, pixels are not ready to be displayed to the screen. Pixel will be sent back to the Video RAM to be stored. VRAM is connected directly to the digital-to-analog converter (DAC). This converter is also called the duty RAMDAC image translates into an analog signal that can be used by the monitor. Furthermore, RAMDAC sends the final image to the monitor via cable.