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6950 Cant get 3 displays

Last response: in Graphics & Displays
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October 4, 2011 12:35:54 PM

Heya guys,
So I have a problem, my computer won't allow me to use more than two monitors, it says, "To extend the desktop, a desktop or display must be disabled." I'm really at a loss trying to figure out why this message is coming up, I have read a bunch of threads on here that appear to be the same problem but have been unable to find the solution.
My setup is;

Graphics: Radeon 6950
CPU: Intel Q9400
MOBO: Asus P5Q SE/R
RAM: 8GBB (4x2GBB)
DISPLAY: 3x 42" Soniq LCD TVs
OS: Windows 7 64 bit

The Video outputs i am using are
1 x DVI to HDMI cable
1 x HDMI Cable
1 x Active Display Port (USB powered) to HDMI adaptor > HDMI cable

Any Help or advice would be greatly appreciated.

More about : 6950 displays

a b U Graphics card
October 4, 2011 12:38:37 PM

Are you trying to setup Eyefinity 3x1 or just a 3 head display?
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October 4, 2011 12:43:52 PM

Eyefinity 3x1 but it would be nice to be able to switch to a 3 head display also, can't see why i shouldnt be able to.
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a b U Graphics card
October 4, 2011 12:51:17 PM

Make sure you're using the latest drivers with CCC installed. As long as you're going for 5760x1080 that should work fine. Confirm that your DP to HDMI adapter is actually working; un-plug the other displays and check to see if that one works. Also try using the other display port. I found on my setup that it would not let me activate Eyefinity if I had the mini-DP to DVI adapter plugged into the mini-DP closest to the DVI ports, but worked perffectly if I had it plugged into the outside mini-DP.

Also; once you do get Eyefinity working save a preset, but go to "Basic View" save your preset then back to "Advanced View" in CCC. Then do the same with Eyefinity disabled with just two extended desktops. For whatever reason I can never get presets to actually work unless you switch to "Basic View" before saving them.
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October 4, 2011 1:06:44 PM

the 3 different displays are definitely working, as is the dp to hdmi adaptor. I can get any 2 of the three monitors working no problem, its just 3 i can't get. I tried using the other display port to no avail.
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a b U Graphics card
October 4, 2011 1:20:10 PM

Try swapping DVI ports. When you use a DVI and an HDMI port one of the DVI ports get's deactivated. Same if you were using both DVI ports, the HDMI port would be deactivated. Do you have another DVI to HDMI adpater? You could try DVI to HDMI x 2 and DP to HDMI.
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October 4, 2011 1:30:23 PM

I swapped DVI ports, unfortunately i do not have another dvi > hdmi adaptor, however i can confirm that any combination of 2 of the 3 monitors does work, so the HDMI and DVI are working simultaneously. Question, does the usb of the active DP>HDMI adaptor only supply power?
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October 4, 2011 1:32:36 PM

on my 5870 i need to use the display port, i cant use 2 dvi and an hdmi. only an active display port adapter worked for me.
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a b U Graphics card
October 4, 2011 1:36:33 PM

spazworm said:
I swapped DVI ports, unfortunately i do not have another dvi > hdmi adaptor, however i can confirm that any combination of 2 of the 3 monitors does work, so the HDMI and DVI are working simultaneously. Question, does the usb of the active DP>HDMI adaptor only supply power?


I would assume. My active mDP to DVI adapter does not have a USB plug so I'm not 100% sure, but I don't see what else it would do.
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October 4, 2011 1:40:48 PM

I was looking around and saw this, is this an issue? it says the card is only 1gig when it is actually 2gig?
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a b U Graphics card
October 4, 2011 1:49:20 PM

Running the latest drivers? Get them here if you're not running CCC11.9

That is odd, did you buy the card new?
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October 4, 2011 1:54:26 PM

Yea i bought the card new, it is a 6950 for sure
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October 4, 2011 2:09:19 PM

go grab GPUz and check the bios of the card. that will confirm which version of card you have
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October 4, 2011 2:35:45 PM

card Link

k so its this card


bit annoyed, thought i got my hardware guy to put in a 2ggb card (edit, my mistake i asked for this particular card) but it should still work
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October 4, 2011 2:38:25 PM

you have a 1GB card. the cards are identical, same clock, memory, die size, transistors, bandwidth and bus width... even the same bios is used on both cards. the ONLY change is the price and the memory. so you bought a 1GB card, not a 2GB card.

i just looked up all the specs on both cards
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a b U Graphics card
October 4, 2011 2:38:57 PM

spazworm said:
card Link

k so its this card


bit annoyed, thought i got my hardware guy to put in a 2ggb card


I would be too! I'd say call him up, you're going to want that 2GB for Eyefinity for sure.
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October 4, 2011 2:39:34 PM

yea, the 6950 2GB is only about 20 or 30 bucks more than the 1GB :/ . on a side note if you are feeling adventurous and want some more power. people have been flashing there 6950's to 6970's. idk if it works but its on the tech power up fourms.
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October 4, 2011 2:43:18 PM

for now i have no idea why eyefinity doesn't work...
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a b U Graphics card
October 4, 2011 2:48:31 PM

I would almost be willing to place the blame on the DP to HDMI adapter. It can be kind of picky when it comes to adapters. What make/model is it?
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a b U Graphics card
October 4, 2011 2:56:00 PM

You must use 2 dvi and 1 active DP to something to use eyefinity. You could use a dvi to hdmi adapter.
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October 4, 2011 2:56:02 PM

think ill get another one tomorow to see if thats the problem
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October 4, 2011 3:06:36 PM


HMMMMM so far as i could tell it says i can use one hdmi one dvi one dp

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a b U Graphics card
October 4, 2011 3:11:19 PM

Yep one HDMI and one DVI *should* work. I was looking to see if I could find you a cheaper ACTIVE mDP to HDMI, but I didn't have any luck. I found some cheap passive ones but that's not what you need. The Sapphire mDP to DVI adapter I use was only $25... I wonder if an active mDP to DVI combined with a DVI to HDMI would work? Probably not.
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October 5, 2011 1:20:13 AM

I'm sure an active male mDp to female dvi adaptor with a male dvi to HDMI lead would work seein as dvi and HDMI are exactly the same signal just with audio.

I'll try and get my hands on one to try it out ASAP, I'll try using the two dvi slots instead of the HDMI slot on my video card also.
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October 5, 2011 6:32:52 AM

Ok just an update, i tried using both of the DVI slots instead of one hdmi, one dvi and one display port, Didn't make a difference. However I'm Almost Positive i have found the problem now, the Mini Display port to HDMI adaptor i have, while it does have a usb, it musn't be active. So steer clear of the GC-MDPHDMI-U, it seems the USB is just for audio.
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a b U Graphics card
October 5, 2011 12:07:17 PM

Yep I bet that's the prob... I'm using one of these. There are a few other options on the Egg that are a little cheaper now and probably work just as well. Combine that with something like this and you should be good to go.

Let us know if you get it working, Eyefinity is going to be sick on those screens, I thought three 24" screens were cool. You may also find that you'll want to pop a second 6950 in there down the road, but YMMV.
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!