All I see is one card unusable @stock (HD 6990, even louder than 2 GTX 480 in SLi) and another one (GTX 590, cool noise and approx. same temps than HD6990) that is usable @stock.
With proper drivers and soft voltage modding, the card oc quite well.
But, you're certainly right, power regulation seems insufficient for massive OC.
Anyway, Damien take another thermal shoot, more precise :

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