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Eyefinity on 7970? One display always missing...

post #1 of 14
Thread Starter 
Hey guys, I bought three BenQ monitors that were on sale. I intended to use them for Eyefinity on my Gigabyte HD7970 OC. Now, the back of my 7970 has DVI-D, HDMI, and two Mini-displayport connectors. The monitors I bought only have DVI and VGA connectors on the back.

The way I've hooked up the monitors are as follows...

1. DVI to DVI
2. HDMI to DVI
3. Mini-DP adapter to HDMI cable to DVI adapter

When I fire up my computer after a driver uninstall and sweep, the only screens that show up are 2 and 3 (both peripheral). I then install the newest CCC drivers (currently Cat 12.11B7). Once the driver is done installing, there is no prompt for a restart but I restart anyways out of habit. When I boot back into windows, I still only have the two peripheral screens active (and duplicated). Upon opening up CCC and checking the desktop management tab, I can see there are three screen visible but only one has a "number 1" attached to it. If I right click any of the non-numbered screens the following options are available...

Duplicate
Extend
Replace

I can activate an additional monitor with any of the above options. BUT! I can only do that for ONE additional monitor. Once two monitors are "numbered" (actively turned on), the right click options for the third remaining monitor lose the Duplicate button. Now, if I right click the remaining monitor to add it to the rest of the group, a CCC warning appears saying...

"To extend the desktop, a desktop or display must be disabled."

This makes no sense to me since the graphics card is detecting all the displays correctly.

The big question is, why can't my video card display all three monitors simultaneously? I don't have anything hooked up with VGA. The only reason I can think this is happening is because I am using HDMI as an videocard output for one monitor. I've heard HDMI and Displayport don't play nice together. Would buying an additional Mini-displayport to DVI adapter fix this issue by eliminating the HDMI connector on the video card? Are there any tips or tricks for setting up Eyefinity with three DVI monitors but limited to what is on my graphics card?

Thanks for your help anyone and +rep for everybody who helps me troubleshoot this thing!
post #2 of 14

You can't do that. The chip that's dedicated for the hdmi is also for the dvi since it's the same signal and it cannot do both at the same time. You need to get another dp-dvi adapter in order to get it running.

 

This one for 6$ worked fine with my 7770:

 

http://www.ebay.com/itm/18CM-Thunderbolt-Mini-Displayport-to-DVI-DVI-D-Adapter-Cable-For-Apple-Mac-AC21-/251169382835?pt=US_Video_Cables_Adapters&hash=item3a7adca1b3


Edited by noobhell - 11/17/12 at 12:49am
post #3 of 14
Quote:
Originally Posted by noobhell View Post

You can't do that. The chip that's dedicated for the hdmi is also for the dvi since it's the same signal and it cannot do both at the same time. You need to get another dp-dvi adapter in order to get it running.


You're mistaken. The HDMI port can most certainly be used at the same time as DVI on the 7970.



To the OP.

You must use an active miniDP adapter. There are no certified active miniDP to HDMI, because that would be breaking HDMI's license. You must get a active miniDP to DVI adapter instead.
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post #4 of 14
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

You're mistaken. The HDMI port can most certainly be used at the same time as DVI on the 7970.
To the OP.
You must use an active miniDP adapter. There are no certified active miniDP to HDMI, because that would be breaking HDMI's license. You must get a active miniDP to DVI adapter instead.

Thanks for the help noobhell and tsm106! I ended up using the suggested mini-displayport to active DVI adaptor and now everything is working! I'm so stoked!!!!
post #5 of 14
I'm having a very similar problem so I'll piggyback on this one. I just picked up an MSI Twin Frozr 7950 for $269 at Fry's, and brought it home fully expecting to be able to run eyefinity out of the box like I could run surround with my 860. Boy was I mistaken! I have 3x Asus VW266H, one HDMI->HDMI, One DVI->DVI and one miniDP->DVI using an Accel active but unpowered adapter, very similar to the Sapphire ones everyone recommends from newegg (actually, I think it might be the same part with a different name on it). I have 3 of these adapters I have used in the past on HD6xxx cards with no issues, so I know they work. I get display from the HDMI port and DVI port but the miniDP won't output anything at all, the card doesn't even detect the screen in either port.

Any suggestions? Did I get a bad card?
post #6 of 14
Get a hdmi to dvi adapter.
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post #7 of 14
Quote:
Originally Posted by tsm106 View Post

Get a hdmi to dvi adapter.

How will this help the DP output? It will not output to either of the miniDP even if that is the only thing plugged in to the card. I think the card might be bad at this point, I checked and my adapters are listed as "gold" qualified on AMD's page so its either I have 3x bad adapters or one bad card. This is super disappointing, I have owned three different HD7000 series cards, two 7970 and now this 7950 that all had problems. mad.gif
Edited by Scorpion49 - 11/17/12 at 2:17pm
post #8 of 14
Quote:
Originally Posted by Scorpion49 View Post

Quote:
Originally Posted by tsm106 View Post

Get a hdmi to dvi adapter.

How will this help the DP output? It will not output to either of the miniDP even if that is the only thing plugged in to the card. I think the card might be bad at this point, I checked and my adapters are listed as "gold" qualified on AMD's page so its either I have 3x bad adapters or one bad card. This is super disappointing, I have owned three different HD7000 series cards, two 7970 and now this 7950 that all had problems. mad.gif

I see.

The odds of having 3 cards all with bad ports and 3 bad adapters is freakish. I would start checking your dvi cables. I've seen incompatibility problems associated with cables. Regarding the other 79xx cards, were they returned for this port issue?
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post #9 of 14
Quote:
Originally Posted by tsm106 View Post

I see.
The odds of having 3 cards all with bad ports and 3 bad adapters is freakish. I would start checking your dvi cables. I've seen incompatibility problems associated with cables. Regarding the other 79xx cards, were they returned for this port issue?

No they had other issues, and it was a while back.

Ok, so I discovered the mini DP do actually work. I used the MSI included miniDP to DP adapter, then daisy chained a DP to DVI on top and it will display. I can get any set of two displays out of the card using this setup, but it will not detect all 3 at the same time. I tried hooking up DVI and two active adapters and it only detects the DVI. Maybe this MSI model is not compatible with the Accell adapters even though AMD's page says it should be? They are model B087B-006B.
post #10 of 14
Nevermind, it was the card. I went and got two active USB powered dp adapters and it still didn't want it, so I returned those and the 7950, picked up a 7970 and it works fine.
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