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Nope not a problem here.
Was this a new build?or did you have different graphics drivers installed before.
VTX 6870's in x-fire, all fine here.
Just installed the display driver only, put the bridge on and that's it.
Everything you need to know is in the thread roddypoddy posted.
Basically, I think the card isn't getting enough voltage to run at the 900mhz it should. It seems you have three choices:
1. Decrease the clock speed.
2. Increase voltage.
3. Buy a different card.