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Windows 7: Same output on monitors 2 and 3

10 Nov 2014   #1
senoj

Win 7 64 bit
 
 
Same output on monitors 2 and 3

I have an ATI Radeon 4800 that outputs my primary and secondary monitors from its 2 DVI ports. I have added a Radeon 5450 with VGA output to add a third monitor. Everything works and I get my primary display plus two different extensions, but that is not what I want. What I want is for monitor 1 to be primary and the same extension to go to monitors 2 and 3. Is this possible? If I didn't need VGA to go to a VGA monitor and a VGA projector I would just split the DVI going to monitor 2. I'm hoping that I don't have to buy a new monitor and projector.


My System SpecsSystem Spec
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10 Nov 2014   #2
oscer1

win 7 64 bit
 
 

My System SpecsSystem Spec
10 Nov 2014   #3
dsperber

Windows 7 Pro x64 (1), Win7 Pro X64 (2)
 
 

I don't follow what you want.

Do you want to run in "clone mode", where your desktop is just one single monitor and the identical screen is presented on all three of your display devices?

Or do you want to run in "extended desktop mode", where your Windows desktop is essentially three monitors wide, and the entire triple-wide desktop is spread horizontally across all three monitors?

Or am I still not understanding your objective?
My System SpecsSystem Spec
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10 Nov 2014   #4
oscer1

win 7 64 bit
 
 

from what i get from the title of the thread and the body of it. is he wants to extend the display but have monitor 2 and 3 be cloned(mirrored)
My System SpecsSystem Spec
10 Nov 2014   #5
dsperber

Windows 7 Pro x64 (1), Win7 Pro X64 (2)
 
 

Quote   Quote: Originally Posted by oscer1 View Post
from what i get from the title of the thread and the body of it. is he wants to extend the display but have monitor 2 and 3 be cloned(mirrored)
Interesting goal, I suppose.

I've not worked with a setup that had two video cards, nor one that had three monitors. So I don't know if Catalyst Control Center (or Windows display properties) can configure things as you describe... which is really an extended desktop of only "two monitors wide", where the second monitor is also simultaneously cloned to a third monitor (thus showing exactly what's on monitor #2).

If so, I would think the best chance would be to have monitors #2a and #2b on the second video card (new HD5450), using the DVI output for #2a and the VGA output for #2b. At least with that setup I could imagine a possible configuration where both monitors connected to that one video card are sent the identical output.

And then it might be possible for Windows to spread its desktop to be only TWO MONITORS WIDE, i.e. across #1 and then onto #2a and #2b simultaneously.

But I don't know. Never tried to achieve this.

As you suggested earlier, perhaps a DVI splitter cable like you pointed to would be a hardware solution that seems like it should work (from the second DVI port on the primary video card), eliminating the need for the second video card entirely.
My System SpecsSystem Spec
10 Nov 2014   #6
senoj

Win 7 64 bit
 
 

Thanks for the suggestions. Yes, I want to extend the desktop and mirror monitor 2 and 3. DVI splitter would work great but would require me to buy a new monitor and projector. I will try setting this up with #2 and #3 running from the same card and see if there are any more options that way.
My System SpecsSystem Spec
10 Nov 2014   #7
oscer1

win 7 64 bit
 
 

ok keep us posted how it goes. the dvi splitter was one dvi and one vga
My System SpecsSystem Spec
11 Nov 2014   #8
senoj

Win 7 64 bit
 
 

Thanks for that last post. I didn't know that a DVI VGA splitter existed. If I had known that from the beginning, I could have saved the expense of the 2nd card. I have ordered a splitter and will post the result after it's installed.
My System SpecsSystem Spec
11 Nov 2014   #9
oscer1

win 7 64 bit
 
 

ok good luck hope it works out
My System SpecsSystem Spec
20 Nov 2014   #10
senoj

Win 7 64 bit
 
 

The splitter did not solve my problem. It would drive either the VGA or the DVI with HDMI attached to it, but not both at the same time. The only way to get a signal to the VGA is to disconnect the DVI connector. It looks like I will have to replace my VGA monitor and projector with HDMI and use an HDMI splitter.
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 Same output on monitors 2 and 3




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