As to fan noise... I own one of these cards and it is pretty quiet at 1.22v 1200/1600 OC. It's significantly quieter than my XFX DD Black Edition 7970 was at that clock, though it is not as quiet as my previous card (8800 GTS) was.
Granted, I have very good case ventillation (2x120mm front + side intake, 3x140mm top/rear exhaust), but still... I dunno about the noise results here, especially since noise isn't a big complaint in other reviews of this card.
I'm getting good temps (sub-75C) with only marginal fan noise, at a pretty high overclock. Now, I don't use OCCT/Furmark, so if that's the test here for noise then I could see things being different. However, for hours of gaming, I have no complaints with temps/noise.
Wish that the one OC test for this card was something where the 680/7970 perform more similarly in... the 7970 does really poorly in some old DX9 games like COD. It would be like testing a 680 OC on AVP... doesn't give a good indication of the average performance boost compared to the other card. I think 54thvoid's point above is very important to note when comparing the 7970 and the 680.