Add a second monitor to your PC

Now that you've worked out the graphics-card conundrum, connect the secondary monitor. If your card or combination of cards includes a DVI port, you'll probably want to connect the primary monitor to the DVI port and the secondary monitor to the analog port. Some monitors have dual analog and digital inputs and can take advantage of whatever output is available. If neither monitor has a DVI port, don't worry. You can buy an inexpensive adapter that enables you to connect it to your PC's DVI port. It will still be an analog signal, however.

As a quick recap, analog connectors have three staggered rows of five pins each, while digital connectors have three uniform rows of eight pins each, with an additional four-pin-plus-blade connector arranged in a square.