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VGA vs. DVI

VGA and DVI are very different signals and can even output video at very different qualities as well. Out of all the video interfaces that are available VGA and DVI are found on computers more often than any others. One of the biggest differences between VGA and DVI is that VGA is an Analog signal and has been around for quite some time and DVI is a Digital signal that is newer and is being used more often.

As you can see in the photos below the pin layouts are significantly different between VGA and DVI and they must be plugged into their appropriate connection.

DVI Connector DVI-D Dual Link
DVI-D Single Link DVI-A
DVI-I Dual Link DVI-I Single Link
VGA
VGA

DVI has many more types of pin out connections to differentiate between from to make sure it is compatible with the setup you are trying to accomplish while VGA has only one type of pin out on it.

You can read more about DVI and see what the differences are between all of the DVI connections pictured above here.