dvi vs vga

which is better
why
how many lines per inch
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rgb192Asked:
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☠ MASQ ☠Commented:
1- dvi
2 - because it's a digital signal while vga is analogue
3 - depends on your screen resolution

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DarinTCHSenior CyberSecurity EngineerCommented:
you can use both simultaneously
have 2 monitors
1 using either connection
CallandorCommented:
DVI and VGA are virtually indistinguishable when using good quality cables and the display is smaller than 30 inches.  If you have a choice, DVI would be better because it will handle larger displays and maintain picture quality, and most video cards are now DVI-only.  I have used VGA on a 100-inch projector display and have gotten good results, though.  If you go beyond 1920x1080, you will need a dual-link cable, which is more expensive than a single-link one.
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dataguttenCommented:
LCD screens use a digital signal to make the picture. For them it would be a unnecessary step to first convert the signal to analog vga and then back to digital.
CRT screens use a analog signal to make the picture. For them it is good to use analog VGA.
Dave BaldwinFixer of ProblemsCommented:
Intel and Dell have announced that they are dropping support for VGA in a couple of years.  If you're buying something new, get DVI/HDMI displays.
Gary CaseRetiredCommented:
"... which is better ..."   ==>  Electrically DVI is "better".     All modern displays are digital, so if you use VGA the video is internally converted to analog (VGA) in the graphics card;  and must then be converted back to digital by the display.    With DVI it's simply transmitted in its digital form, so there's no conversion loss.    From a practical perspective, however, you won't be able to "see" the difference for most displays/resolutions.

"... why ..."   ==>   The digital/analog and analog/digital conversion steps cause a small amount of quality loss.

"... how many lines per inch ..."   ==>  This isn't a function of the interface, but of the settings on your video card.    The maximum you can use IS determined by the bandwidth of the interface, but for resolutions up to HD (1920 x 1080) either interface works fine.

One other point:   Note that many graphics cards have a DIFFERENT set of resolutions they support in digital vs. analog mode.    If you know the specific resolution you need, check to confirm that it's supported in the specific mode (VGA/DVI) you want to use.
aleghartCommented:
From a server perspective...KVMs are far cheaper using VGA.  DVI KVMs are more expensive, especially at the lower end, like a 4x1.  You're looking at $30-50 for VGA, versus $175-300 for DVI.

That being said, my VGA KVM has problems with flickering at high resolutions (1900x1080) that will not go away, even after tweaking the monitor controls and setting all the outputs at 60Hz.  I have to use the DVI port to get a stable picture and decent color calibration controls.  Running analog signals through multiple cables and a switch does bad things to the picture quality.
DarinTCHSenior CyberSecurity EngineerCommented:
I guess we need to know if your looking short term or long term
Are you looking for a new monitor or a new video card
there are limits in VGA
DVI may cost a little more
Currently DVI are more popular
eventhough the larger number currently being used in the real world is definately VGA

you can still buy a video card that uses both and is affordable
aleghartCommented:
Also, what's your purpose for the connector?  Input for a monitor, or output from a video adapter?

For cable reduction (especially using a laptop), then go with HDMI.  The audio will usually carry over the same cable, and the connectors are smaller at both ends.  It's not easy to carry a bulky DVI or VGA cable, plus keep a fragile audio/headphone cable from getting kinked.

I use the HDMI port almost all the time.  HDMI->DVI at work, then HDMI->HDMI at home for watching movies or general computer work on a 24" monitor.
rgb192Author Commented:
thank you all
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