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How to enable crossfire with two Gigabyte 7950s?

post #1 of 17
Thread Starter 
Hi guys,

Hopefully I haven't missed anything in my build in my signature. This is my first time Crossfiring video cards and I've googled around but still seem to come up with nothing. After a fresh installation of Windows 7 on a new SSD, I loaded up my second 7950 that I bought and installed it to my motherboard.

Here's a GPU Z screenshot which doesn't recognize the second 7950:



Here's a bigger image of what the two graphics cards are looking like sitting in the case. It's not the prettiest right now but it'll get there: http://i.minus.com/ibbBWSorcU3FLa.jpg

Things I know:

  • The Crossfire ribbons are installed (had a spare, so I put the second one on there too).
  • The second graphics card is clearly on and functioning (fans are spinning).
  • I do not see a Crossfire option in AMD's CCC utility (13.3 beta).


Any suggestions?

I appreciate the help. Thanks!
Edited by Mnemosyne - 4/4/13 at 6:37pm
post #2 of 17
Quote:
Originally Posted by Mnemosyne View Post

Hi guys,

Hopefully I haven't missed anything in my build in my signature. This is my first time Crossfiring video cards and I've googled around but still seem to come up with nothing. After a fresh installation of Windows 7 on a new SSD, I loaded up my second 7950 that I bought and installed it to my motherboard.

Here's a GPU Z screenshot which doesn't recognize the second 7950:



Here's a bigger image of what the two graphics cards are looking like sitting in the case. It's not the prettiest right now but it'll get there: http://i.minus.com/ibbBWSorcU3FLa.jpg

Things I know:

  • The Crossfire ribbons are installed (had a spare, so I put the second one on there too).
  • The second graphics card is clearly on and functioning (fans are spinning).
  • I do not see a Crossfire option in AMD's CCC utility (13.3 beta).


Any suggestions?

I appreciate the help. Thanks!

Have to look under performance tab in CCC. Believe me its there.
 
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post #3 of 17
Thread Starter 


I did check that however I am still not seeing it. Is there something that I am missing or forgetting to do?

I'm on 13.3 drivers.
post #4 of 17
That's odd.. I can't see it making a difference.. but have you tried it with a single crossfire bridge? I've heard that running 2 on a dual card setup can cause issues, and sometimes a decrease in performance

Edit:
Are you running more than one monitor? if so make sure you only have them plugged into the primary card.

Also are both cards showing as being correctly installed in device manager?
Edited by Spengler - 4/4/13 at 6:49pm
post #5 of 17
Quote:
Originally Posted by Mnemosyne View Post



I did check that however I am still not seeing it. Is there something that I am missing or forgetting to do?

I'm on 13.3 drivers.

Wow...that weird...I would re-install.
 
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post #6 of 17
Thread Starter 
Quote:
Originally Posted by Spengler View Post

That's odd.. I can't see it making a difference.. but have you tried it with a single crossfire bridge? I've heard that running 2 on a dual card setup can cause issues, and sometimes a decrease in performance

Edit:
Are you running more than one monitor? if so make sure you only have them plugged into the primary card.

Also are both cards showing as being correctly installed in device manager?

That's a good point. After noticing that only one card is displayed under Device Manager, I shut down my computer and removed the secondary Crossfire ribbon cable. I also moved the three display adapters (three monitors connected via mini HDMI, Displayport, dual-link DVI) to the primary/first videocard. Upon reboot, I was not able to get video on any monitors. Shut the computer down, moved all of the display cables back to the secondary 7950, booted it up again, and was able to receive video and get into Windows.

I'm starting to run out of ideas. Is there anything that I am missing?

post #7 of 17
Did you install drivers after you had both cards plugged in or just one? I would reinstall gpu drivers just to see what happens first.

Have you verified second card works in first pcie slot and vice versa? Could be either bad card or bad pcie slot.
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post #8 of 17
Next thing I would be doing is testing each card by itself (1 at a time) in your primary PCIE slot and making sure it is functioning, if this works OK I would be checking to see that both PCIE slots are enabled in your BIOS. (Some BIOSes let you disable additional PCIE slots, I can't see it being like this as a default but it's worth checking.)

Edit:
As for the no display issue, try just using a single monitor while you get crossfire running.. I can't be sure off the top of my head, but I have a hunch that using the HDMI port will disable a mini displayport (I understand that this wouldn't cause a no display issue on all 3 of your monitors, but it can't hurt to keep it simple while you are troubleshooting) smile.gif
Edited by Spengler - 4/4/13 at 7:29pm
post #9 of 17
Thread Starter 
I actually think that it might be a power supply issue. As seen in the original post in this thread, I'm connecting the secondary video card through this.

So the one six pin power cable connected from the PSU to the two molex > three + four pin PCI-E adapters. It isn't exactly an elegant solution, however I don't have another 12 pin slot available to me (I'd normally use this, which is exactly what the other video card is using).

What do you guys think? Do I really have to buy another PSU or there a simpler fix for this?
post #10 of 17
Quote:
Originally Posted by Mnemosyne View Post

I actually think that it might be a power supply issue. As seen in the original post in this thread, I'm connecting the secondary video card through this.

So the one six pin power cable connected from the PSU to the two molex > three + four pin PCI-E adapters. It isn't exactly an elegant solution, however I don't have another 12 pin slot available to me (I'd normally use this, which is exactly what the other video card is using).

What do you guys think? Do I really have to buy another PSU or there a simpler fix for this?

I did notice that in the original picture you posted but figured it would be a safer bet to rule out other options before recommending a new PSU..

Does you primary GPU work if you use this method to power it?
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