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02.27.2008 at 07:27AM PST, ID: 23197144
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Can VGA and DVI outputs be used at the same time?

Tags: ATI, Radeon 9700 Pro, VGA and DVI ports on the back
I have an ATI Radeon 9700 Pro graphics card (yes, I'm aware that it's no longer cutting edge), and I'm hoping someone knows whether the following is possible:

The graphics card has a backplate with both a VGA and a DVI output, and I'd like to be able to connect my old CRT monitor (with a VGA cable) and my soon-to-arrive new LCD monitor (with a DVI cable) and see the same output on both monitors.

Can this be done safely (without damage to the card or the monitors) and if so, will the screens both display the same image at its best, or would splitting the signal across two monitors degrade the picture?
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Question Stats
Zone: Computer Hardware
Question Asked By: HackneyCab
Solution Provided By: CarlosMMartins
Participating Experts: 3
Solution Grade: A
Views: 46
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02.27.2008 at 07:53AM PST, ID: 20994972

Rank: Genius

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02.28.2008 at 05:31AM PST, ID: 21003443

Rank: Master

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03.02.2008 at 04:36AM PST, ID: 21025776

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02.27.2008 at 07:53AM PST, ID: 20994972

Rank: Genius

Dual port cards, regardless whether they are VGA or DVI, are designed to output to both simultaneously without risk.  Both screens should display the same desktop without degradation of quality, and you can choose to display different windows by selecting "extend my desktop".
 
02.28.2008 at 05:31AM PST, ID: 21003443

Rank: Master

Just to expand a bit on what Callandor said.

Yes, you can safely use both outputs at the same time.

When you have devices connected to both outputs you'll be given aditional options for multi-display modes.

What you'll want is the "clone" mode, that effectively send the same screen to both outputs.
(most likely you'll need to have the same resolution in both screens)

If you use it in "extended mode", you'll be able to use both monitors as a large screen - when you move your mouse off one, you'll enter the other screen. This is usually more useful if you're using it as a work computer, where you can have twice the desktop area to place windows and programs.
(this also works if one screen has different resolution from the other)

If however, all you want to do is to duplicate the PC output, then the clone mode is all you need.
Accepted Solution
 
03.02.2008 at 04:36AM PST, ID: 21025776
Just to add on what has been said already... Yes it will work I'm running 2 LCD's from a graphic card 1 from VGA and 1 from DVI (with a DVI-VGA converter)...

But instead of the same display on both monitors you should extend you display to the second monitor, it's like having 2 monitors for the 1 computer.
 
 
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