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Author Topic: DVI vrs VGA  (Read 928 times)

Offline Dark

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DVI vrs VGA
« on: February 09, 2010, 02:01:42 AM »
OK just a simple question. Is there any performance gain if I use dvi or vga. Reason I'm asking is I currently run a vga line with dvi adapter. I got a dvi line for free and was thinking of hooking it up. Problem is it would be a chore to do and the line is 25ft long so would have to wrap it up somehow.  Monitor has all the diff conections and so does the gpu so there won't be any adapters at all. Just wondering if it would be worth my time
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Offline Ghastly

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Re: DVI vrs VGA
« Reply #1 on: February 09, 2010, 06:05:14 AM »
DVI is better than VGA, all else being equal.  However, I've never heard of a 25 ft DVI cable for use with a computer.  Unless it's the highest quality imaginable (i.e. 30+ dollars per foot) I have a hard time believing that it's not going to suffer a serious loss of bandwidth over such a distance.

Ideally, you want video cable's to be as short as possible.  And a short VGA cable might be better visual quality than an overly long DVI cable, depending upon environmental factors.

How's that for a non-answer answer?

<S>

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Offline TequilaChaser

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Re: DVI vrs VGA
« Reply #2 on: February 09, 2010, 06:59:28 AM »
I agree mostly with Ghastly, however I have always noticed my DVI connection will cut my frame rate gain by 5 or 10 FPS over hooking it up thru VGA connection........
why that is I do not know...... it might just be my monitor....DELL UltraSharp 19" LCD ( has both types of connections )

I use the DVI connection though, WindowsXP gives me 70 framerate.... same PC/Monitor I get 75 framerate in Windows 7....using 1280x1024 res........

hope this helps.......
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Offline Kermit de frog

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Re: DVI vrs VGA
« Reply #3 on: February 09, 2010, 07:01:50 AM »
If the signal for the DVI cable is in digital mode, you will have a better colors and less pixel jitter, especially for long cable runs like in your situation.
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Offline Masherbrum

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Re: DVI vrs VGA
« Reply #4 on: February 09, 2010, 07:08:49 AM »
Quote from: Kermit de frog on February 09, 2010, 07:01:50 AM
If the signal for the DVI cable is in digital mode, you will have a better colors and less pixel jitter, especially for long cable runs like in your situation.

Correct.
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Offline SIK1

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Re: DVI vrs VGA
« Reply #5 on: February 09, 2010, 10:10:31 AM »
You can find your cables here.

http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10209

They are as good or better than monster cable, and a heck of a lot cheaper.
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Offline gyrene81

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Re: DVI vrs VGA
« Reply #6 on: February 09, 2010, 11:27:15 AM »
Quote from: Kermit de frog on February 09, 2010, 07:01:50 AM
If the signal for the DVI cable is in digital mode, you will have a better colors and less pixel jitter, especially for long cable runs like in your situation.
Yes and there is a difference between the cables and the connections:




My freebie cable was a DVI-A so I went and found a DVI-I (dual link)...much better picture quality.
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Offline BaldEagl

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Re: DVI vrs VGA
« Reply #7 on: February 09, 2010, 02:56:16 PM »
I use a DVI cable.  For some reason when I use a VGA cable my 8800 GTS 512 G92 and LG 22" monitor won't scale properly and place the picture in the middle of the screen with black surrounding it unless the source is set at my monitors resolution settings.  With a DVI cable it automatically scales to fit my screen.
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Offline Dark

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Re: DVI vrs VGA
« Reply #8 on: February 09, 2010, 11:48:42 PM »
Well the cable is a dual link cable with the pics that you posted. Quality is just fine with the vga cable I run now just wondering if it would give any performance increase if I was to switch it to straight dvi. Guess will just stay with the VGA cable. Thx fellas

Dark
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Offline Kermit de frog

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Re: DVI vrs VGA
« Reply #9 on: February 10, 2010, 12:36:39 AM »
The performance increase will result in improved colors.
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Offline Masherbrum

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Re: DVI vrs VGA
« Reply #10 on: February 10, 2010, 01:12:22 AM »
Quote from: Kermit de frog on February 10, 2010, 12:36:39 AM
The performance increase will result in improved colors.

Yep again, if your Monitor is DVI capable, utilize it. 
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Offline Tigger29

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Re: DVI vrs VGA
« Reply #11 on: February 10, 2010, 10:50:46 PM »
Quote from: Dark on February 09, 2010, 11:48:42 PM
Well the cable is a dual link cable with the pics that you posted. Quality is just fine with the vga cable I run now just wondering if it would give any performance increase if I was to switch it to straight dvi. Guess will just stay with the VGA cable. Thx fellas

Dark

Just hook it up and see!  It's just a cable... I know it's way too long but it can't be THAT big of a deal, right?
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Offline gyrene81

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Re: DVI vrs VGA
« Reply #12 on: February 11, 2010, 09:27:53 AM »
Quote from: Tigger29 on February 10, 2010, 10:50:46 PM
Just hook it up and see!  It's just a cable... I know it's way too long but it can't be THAT big of a deal, right?
Uh yeah it can...there are limitations to wired connections...and the closer you get to that limit the more likely you're not going to get good results.
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Offline BaldEagl

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Re: DVI vrs VGA
« Reply #13 on: February 11, 2010, 12:42:01 PM »
Quote from: gyrene81 on February 11, 2010, 09:27:53 AM
Uh yeah it can...there are limitations to wired connections...and the closer you get to that limit the more likely you're not going to get good results.


Uhoh... my DVI cable was too long.   :noid

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Offline Masherbrum

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Re: DVI vrs VGA
« Reply #14 on: February 11, 2010, 01:00:42 PM »
Quote from: gyrene81 on February 11, 2010, 09:27:53 AM
Uh yeah it can...there are limitations to wired connections...and the closer you get to that limit the more likely you're not going to get good results.


A digital signal will not be affected. 
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