When to Upgrade to DVI
The only case where the difference between DVI and VGA is worth an immediate upgrade is where you already have a digital monitor and your computer (or graphics card) provides a digital signal. If your computer has a DVI connector, it can output a digital signal. It will most likely be a DVI-I connector, since it allows manufacturers to include analog support without having to find space for a VGA port. Your monitor most likely also uses DVI-I, but if it is particularly high-end, it may use DVI-D. Also check to see if they are Dual or Single Link. They are most likely Dual Link.
If you have DVI-I at both ends, you can use a DVI-I cable, which offers greater flexibility (in different applications, not how bendy the cable is) if you decide to use it for something else down the road. You can also use the theoretically superior DVD-D cable. If you have DVI-D at either or both ends, you have to use a DVI-D cable. Cables of both types carrying reputable brand names are available at Newegg for under $10. The cables we have linked to are Dual-Link.
Where possible, go with Dual-Link, whether using a DVI-D or DVI-I cable. Even if your current equipment isn’t using all the bandwidth, your next upgrade might. If either or both of your computer and monitor only have Single Link ports, you will need a Single Link cable. Don’t worry, if your gear could take advantage of Dual Link’s extra pins, it would have them.
If your monitor, despite being an LCD, only has a VGA port (a common practice on lower end products or older products even from reputable manufacturers), it can’t take advantage of DVI, and you should follow the upgrade advice given in the next article.