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Sapphire HD 6870 triple monitor display issues (Windows 8)

Last response: in Graphics & Displays
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May 10, 2014 3:36:03 PM

My 6870 graphics card has:

1 x HDMI
1 x DisplayPort
2 x DVI (1 Single Link, 1 Dual Link)

When trying to hook up all three of my displays to the card, I get the following error message: "The display settings could not be saved. Please try a different combination of display settings." Windows 8 is able to detect all the monitors and use them effectively, but it will only let me have 2 of the displays active at the same time.

I know fairly minimal about which ports have to be "active" in order for the displays to work, but I have tried the following combination set ups all with no success:

Display 1: HDMI to HDMI
Display 2: DVI port with VGA converter to VGA
Display 3: DisplayPort with HDMI converter to HDMI

and

Display 1: HDMI to HDMI
Display 2: DVI to DVI
Display 3: DVI port with VGA converter to VGA

any advice on how to get all 3 of my displays working properly would be greatly appreciated!
a b C Monitor
a c 107 U Graphics card
May 10, 2014 3:42:34 PM

did you check the CCC?
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May 10, 2014 3:49:38 PM

swifty_morgan said:
did you check the CCC?


Yes, and it is only able to prompt me to which display I would like to replace in order to make way for the third one. Pretty much same deal, it detects all three, but it is unable to display on all three simultaneously.
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Best solution

a b C Monitor
a b U Graphics card
May 10, 2014 4:39:54 PM

Basically you will need this setup:

1. For the first 2 monitors you can use any of these cables:
HDMI
DVI
HDMI to DVI (or vice versa)
Displayport
Displayport to DVI or HDMI

VGA may also work, but I am not as familiar with it. If you can avoid analog (aka VGA), then do so.

2. For the third monitor you should use:
Only Displayport end to end or
an "active" Displayport to HDMI or DVI converter, like these:
DVI: http://www.monoprice.com/Product?c_id=104&cp_id=10428&c...
HDMI: http://www.monoprice.com/Product?c_id=104&cp_id=10428&c...
VGA: http://www.monoprice.com/Product?c_id=104&cp_id=10428&c...

Perhaps there is a way to use the third monitor over just VGA without a converter, or maybe there isn't ... but, still, it's better to use only digital connections for all monitors.
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a b C Monitor
a c 107 U Graphics card
May 10, 2014 5:06:51 PM

those are 10 bucks cheaper than I've seen them. have to check out the rest of the site.
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a b C Monitor
a b U Graphics card
May 10, 2014 5:13:11 PM

swifty_morgan said:
those are 10 bucks cheaper than I've seen them. have to check out the rest of the site.

After finding out about them sometime back, I've tended to used them quite a bit when I wanted to specifically purchase cables.


June 05 Edit: Correcting an error in my post. To make the adapter longer, just add any regular DVI/HDMI/VGA cable. An "extension" cable is actually the wrong choice for the DVI / HDMI / VGA side of the adapter. A regular DVI/HDMI/VGA cable will be fine.
  1. Although... technically... for the Displayport side, however, you would need an extension type plug setup, but there's no point in buying an extension cable for the Displayport side of the adapter if you can just add a regular cable to the HDMI/DVI/VGA side.

BTW, on another note. If you get that active adapter, keep in mind that you will also need to purchase an "extension" cable since the adapter is so short.
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a b C Monitor
a c 107 U Graphics card
May 10, 2014 5:27:45 PM

you'd think, the great graphics card manufacturers, in their infinite wisdom, if providing a display port on their cards................ it would be "ready to go".

yes, noticed the cables, thanks.

while I'm thinking about it, I believe I read that some monitors already have a built in one. ( active display port ).
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a b C Monitor
a b U Graphics card
May 10, 2014 5:45:36 PM

swifty_morgan said:
you'd think, the great graphics card manufacturers, in their infinite wisdom, if providing a display port on their cards................ it would be "ready to go".

yes, noticed the cables, thanks.

while I'm thinking about it, I believe I read that some monitors already have a built in one. ( active display port ).


The problem is actually HDMI and DVI; interestingly enough, true Displayport, is actually the solution.

The problem is that HDMI and DVI require a clock signal or TMDS to make them work. In the past ATI has included only two TMDS or clock signals, meaning the video card can only run 2 monitors over HDMI or DVI.

However, Displayport doesn't require any of this. By adding Displayport plugs, they can include support for 3, 4, or 20 monitors.

A Displayport cable connected to a Displayport plug, connected to a Displayport monitor is neither "active" nor "passive" This concept does not apply to an end-to-end Displayport setup.

Where "active" and "passive" come into play is when you are converting Displayport to DVI or HDMI. When you use a passive cable, the system treats it like DVI or HDMI (not like Displayport) with all the downsides. This means such a cable needs it's own clock signal or TMDS... so you are still limited to 2 monitors using a simple passive Displayport to DVI or HDMI cable.

An active Displayport to DVI or HDMI cable is actually a lot more complex than it's name sounds. It actually includes as special chip that adds an extra TMDS or clock signal. Not only that, but it actually converts Displayport to DVI or HDMI so that the video card sees it as Displayport and the monitor sees it as DVI or HDMI.
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