That's easy, tur of OCing in CCC and OC only in AMD GPU Tool, i could put both cards to 800/1100 , but with CCC OC activated i clould set both cards propperly, just one
I not only turned off overclocking in CCC, but also stopped CCC from loading at start-up. Still I get the "fail" message for the card in slot 0. The same card by itself (no xfire) in slot zero, OCs fine.
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