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DVI vs VGA

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Name: xpogi
Date: March 25, 2006 at 10:46:43 Pacific
OS: XP Home Edition Service P
CPU/Ram: 3.07 GPentium 4/1.5G
Product: Gateway E-4100 4000820
Comment:

Perhaps this should be in a hardware section but since I use my computer for Photoshop and Pinnacle Studio and not gaming thought folks here could help me more: What are the advantages (if there are any) of DVI over VGA. Will be upgrading to a multiple monitor graphics card soon and just wondered.

My current 19" LCD has both inputs. I am currently using the VGA on-board video. Will I notice a difference?



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Response Number 1
Name: ham30
Date: March 25, 2006 at 14:01:50 Pacific
Reply:

Using VGA, the signal from the CPU is converted to VGA by the video adapter and sent to a monitor with VGA input.

The conversion to VGA causes some loss of quality.

With DVI the signal is not converted (kept digital) and sent to the DVI input on the monitor.

I think you should see a difference if you purchase a video card with digital output. But, it's a good idea anyway.


Sorry, I do not check for private messages


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Response Number 2
Name: Michael J (by mjdamato)
Date: March 27, 2006 at 10:21:07 Pacific
Reply:

Here's a good article on the subject: LCD connections: analog vs. digital

Quote:
"When connected via an analog connection, an LCD is vulnerable to the same distortions that affect CRT monitors. However, when connected via a digital connection, often labeled DVI (for Digital Visual Interface), no digital-to-analog conversion is required, and there should be no loss or corruption of the signal. As a result, when running at its native resolution, an LCD should give you a cleaner and crisper image than you'd see on a CRT.

...

However, the advantage of digital signals for LCDs is of somewhat less importance now than it was a few years ago. Analog signal processing has improved to the point where major differences in image quality can be difficult to detect."

Michael J


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Response Number 3
Name: Pilot
Date: April 15, 2006 at 14:04:09 Pacific
Reply:

There's quite a bit of difference on my Acer AL1916 monitor between DVI and VGA. I use some funny resolutions, like 132x40 characters in DOS mode, and the VGA is quite blurred and pixelly. DVI is as sharp as a razor by comparison.

Bryan


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