dvi

A standard vga connector is an output for your monitor while dvi is digital video input from devices like digital camcorders to play back video through your pc. For the most part the svga is an analog signal being displayed. When you view the post tests at powering a system that is strictly an analog video signal being generated by the video controller in the system bios.
 
DVI is Digital Visual Interface. It is a better alternative to a regular VGA connector (which is analog). DVI generally boasts better image quality over VGA, although it is usually not noticeable.
 
To display dvi output you would need something like HDTV that accepts input from a digital source such as a digital camcorder as well as the dvi from a video card. A more common substitute for vga is S-Video. You will note that just about new tvs along with flat screen crts have an S-Video input jack. To understand the differences between analog and digital here are a few descriptions to look over.

"composite video - Analog video signal that includes vertical and horizontal synchronizing information. Since both luminance and chrominance signals are encoded together, only a single connection wire or jack is needed."

"DVI - Digital visual interface. Omnidirectional digital connectivity standard that conveys an uncompressed digital signal from a digital source, such as an ATSC tuner, to a display. HDCP copy protection is often used in conjunction with the DVI connection. DVI connections do not carry audio."

These definitions as well as a large score of others can be reviewed at http://www.cnet.com/4520-7874_1-5107912-1.html?tag=hed
 
DVI is meant more for TFT's. Since a CRT's electron cannons need an analog signal, it makes no sense to use DVI.

If it's an LCD however, if you can, go with a DVI cable.
 
If you need high clarity for some type of presentation then you would set up a lcd monitor/HDTV/lcd projection screen with the dvi out. But for general use with a desktop display the analog vga output is the normal there. Your video card software is what allows the dvi to be used for an alternative display.
 
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