Three Monitors Not Working

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September 14, 2014 at 18:31:37
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Hey Everybody,

I recently tried to hook up 3 different monitors to my Radeon HD 7870 graphics card. The monitors are:

1x Acer G185H

1x BenQ GW2255

1x Some off brand monitor a friend gave me...have no clue what brand it is, has no markings.

I have the Acer hooked up via DVI-I (to VGA), the BenQ via HDMI (to DVI) and the unknown monitor via mini DisplayPort (to HDMI).

I thought I remembered reading that most Radeon GFXs that were 5000 or higher could support at least 3 monitors on one card...I also remember that the article said that you could only hook up 2 through Legacy ports (DVI, HDMI) and 1 (or was it 2?) more through DisplayPort.

Does anyone know if this is true or not?

Yes, the card can *technically* support up to 9 monitors - but that's using AMDs Eyefinity technology, when Windows treats the monitors as if they're one...(plus it only has 5 physical connectors...) I'm wanting to be able to have three different windows open on each monitor.

Even weirder, it won't let me duplicate the Acer and the off-brand (they are both 1366x768, whereas the BenQ is 1080p) - this isn't optimal, but certainly better than having them go to waste.


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September 15, 2014 at 03:13:37
You need to use monitors which have the correct inputs on them without using adapter cables. It's the adapters which are causing the problem.

So you need three monitors each having one or other of these inputs:

1) DVI
3) DisplayPort

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September 15, 2014 at 13:56:59
Ah, I see. Well, sadly, I don't own any monitors that natively support DisplayPort, so I guess I won't be using 3 monitors anytime soon (and I don't have any plans to buy a 2nd graphics card either). Thanks for clarifying.

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September 26, 2014 at 18:43:04
Oh, and one more thing, can the graphics card only output via one of the mini DisplayPorts at a time? Because on AMD's website it says a maximum of 6 screens with the use of a MST hub...meaning 2 'Legacy' + 4 on one DP? I know DisplayPort 1.2 can support up to 4x screens (at 1920 x 1200 I believe), so if the card could use both DPs it should be able to do 10 screens...

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