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6990 internal Crossfire not working

post #1 of 6
Thread Starter 
Not sure whats going on here. Crossfire worked fine yesterday, and now it doesn't. Second GPU is showing up under disabled adapter.

I've tried:
upgrading drivers after clean uninstall(driver sweeper) 15.7>15.7.1
after that failed, rolled back to 15.7 with clean uninstall
Also tried re-seating the card same issue.

Noticed some weird stuff on GPUz saying the GPUs are running at PCI-E 2.0 x 16 @ x2 2.0 and PCI-E 2.0 x 16 @ x8 2.0

No other configuration has changed though.

Can't think of what I'm missing
Included HWinfo64 and GPUz screens





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post #2 of 6
Is the PCI-E link width still reported as 2x under load? What happens when you disable ULPS? Have you checked the PCI-E slot and the card's PCI-E connector for damage or anything that would cause poor contact. Have you tried a different PCI-E slot?

It's possible that the board has failed in some manner related to the bridge chip used, or the main PCI-E interface.
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post #3 of 6
Thread Starter 
ULPS is disabled. Contacts look fine, it worked one day. Turned it off for the night, and the next its not working. I have to take out my PSU to check the other lanes, since this has a 3 slot cooler on it. Could it be a PSU issue of the card not getting enough power? I don't think that would mess up the PCI lanes though.
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post #4 of 6
Quote:
Originally Posted by xinpig View Post

Could it be a PSU issue of the card not getting enough power?

Unlikely.

Can you test the card in another system?
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post #5 of 6
Thread Starter 
Tested in the second slot, still showing the same. Tried to do Xfire with a 6970 in the top slot, 6990 in the bottom. Now the 6970 is showing up as 4X bus and the 6990 shows the same as before, but both 6990 GPUS are now listed under disabled adapters. Crossfire bridge was connected. I tried both orientations of the bridge and nothing.

Solo 6970 in the top slot is showing up as PCI-E 2.0 X 16 @ x4 2.0 even with a game loaded up.
Edited by xinpig - 9/19/15 at 7:42pm
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post #6 of 6
Thread Starter 
Tried a few extra GPUs

8600GTS 1.1 X16
5450 2.0 X16
6970 2.0 X16

Tried a few different PSU cables, still x2 x8 no CFX on the 6990. Sadly there's no other computer here that will take a card this long
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