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Windows 7: Can't run 3 monitors at once

11 Apr 2011   #1
msdunkel

Windows 7 Home Premium 64 bit
 
 
Can't run 3 monitors at once

Hello,

I've got a setup that is running 2 ATI 5850s with dual monitors. I tried to add a 3rd monitor but when I do, I get the error message "to extend the desktop, a desktop or display must be disabled". Basically it's only letting me run 2 at a time, any 2 works.

I've got 2 monitors using the DVI??? (whatever the white port is) and one using HDMI. I have tried running all 3 from one card, and I've tried doing various combinations using both cards and I can only get 2 monitors to run.

Not doing any crazy 3d stuff, I just want 3 monitors for my desktop. Any ideas?


My System SpecsSystem Spec
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11 Apr 2011   #2
Markus

Windows 7 Ultimate 64-bit Service Pack 1
 
 

Hm... I imagine you are using the Windows 7 "Screen Resolution" settings.
If so, I think you have to change the settings within the ATI software, which comes with the driver.

Also did you plug in all the monitors to 1 graphics card or both of them?

Also from what I've heard, you have to use Display Port to DVI, because VGA has some problems with response.
My System SpecsSystem Spec
11 Apr 2011   #3
msdunkel

Windows 7 Home Premium 64 bit
 
 

I am using the ATI catalyst control center. For grins I tried the win7 control panel and had similar results.
My System SpecsSystem Spec
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11 Apr 2011   #4
imeem

Win 7 & 10 x64
 
 

I though you have to use a displayport if u want 3 monitors
My System SpecsSystem Spec
11 Apr 2011   #5
Zepher

Windows 7 Ultimate 64bit
 
 

one monitor needs to be Display port if you are running 1 card or 2 cards in crossfire.
If you disable crossfire, you can run the HDMI monitor on one card and leave the DVI monitors on the other card.

here is a list of adapters that will allow you to run 3 screens with Crossfire enabled,
You need to use an Active Adapter,
http://support.amd.com/us/eyefinity/...y-dongles.aspx

I was running a VGA to DP Adapter for awhile then bought an HP Monitor that has native Display Port.
HP 2310e 23" LED monitor.
My System SpecsSystem Spec
12 Apr 2011   #6
msdunkel

Windows 7 Home Premium 64 bit
 
 

Quote   Quote: Originally Posted by Zepher View Post
one monitor needs to be Display port if you are running 1 card or 2 cards in crossfire.
If you disable crossfire, you can run the HDMI monitor on one card and leave the DVI monitors on the other card.

here is a list of adapters that will allow you to run 3 screens with Crossfire enabled,
You need to use an Active Adapter,
AMD Eyefinity Validated Dongles

I was running a VGA to DP Adapter for awhile then bought an HP Monitor that has native Display Port.
HP 2310e 23" LED monitor.
Thank you, this is EXACTLY the correct fix. I had tried different monitors in different cards but with xfire enabled. Once I disabled xfire and put the HDMI in my 2nd card I was good to go.
My System SpecsSystem Spec
24 Jan 2012   #7
Isli

windows 7 home premium 32bit
 
 

i had the same problem with my 3 screens, i disabled crossfire and placed the hdmi in the other card. Now i can have all of them active. But when i want to create an eyefinity group with catalyst, one screen gets rejected anyway.
My System SpecsSystem Spec
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 Can't run 3 monitors at once




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