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6950 crossfire issue

post #1 of 7
Thread Starter 
Howdie. I have a strange issue with my sig rig - before buying a second 6950 everything was fine. After adding it in CF I stopped seeing anything on the screen before Windows booted up, so I was unable to access the bios. After that I switched cards with each other and it's still the same, but with one difference - if I plug my HDMI-DVI cable into card #1 I can see everything windows-related (and only that) and when I plug it into gfx #2 I can see everything that appears before booting Win, but nothing after that. Any idea what could be the issue and how to fix it?
post #2 of 7
I had a similar nightmare installing both my 6950s. I ended up uninstalling them and removing everything AMD related, then I rebooted and let Windows load its generic drivers, then reinstalled the AMD drivers and it worked OK.
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The Beast
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2X Samsung 840 Pro 512GB SSD Samsung Writemaster Windows 7 Ultimate 3X BenQ G2420HDBL 
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post #3 of 7
Thread Starter 
Will try that
post #4 of 7
Quote:
Originally Posted by finger00 View Post
Howdie. I have a strange issue with my sig rig - before buying a second 6950 everything was fine. After adding it in CF I stopped seeing anything on the screen before Windows booted up, so I was unable to access the bios. After that I switched cards with each other and it's still the same, but with one difference - if I plug my HDMI-DVI cable into card #1 I can see everything windows-related (and only that) and when I plug it into gfx #2 I can see everything that appears before booting Win, but nothing after that. Any idea what could be the issue and how to fix it?
Make sure the Crossfire bridge is properly seated. Uninstall Catalyst driver, restart PC and install Catalyst + CAP (Crossfire - Catalyst Application Profile). If you are still seing the same thing, go into BIOS to select first PCIe device to first initialized.

And in Crossfire configuration, all monitors must be plugged to the primary card, else, will disable crossfire by default.
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ケンジ
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post #5 of 7
Thread Starter 
Can't find that option in BIOS. I guess it happens to me because BIOS sees one card as primary and windows sees the other
post #6 of 7
Quote:
Originally Posted by finger00 View Post
Can't find that option in BIOS. I guess it happens to me because BIOS sees one card as primary and windows sees the other
That couldn't be possible. Look in Device Manager under Display Adapters, you should see both 6950s listed there and see if any error message or disabled for the second 6950.
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120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
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ケンジ
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120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
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post #7 of 7
Thread Starter 
Just checked, they're both fine. Going to reinstall the drivers again
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