I have owned several of these cooler and was wondering does anyone else notice a fluttering or slight cherping sound coming from the fans, one of mine is totally silent but I have tried two different ones on my second card. The first one was horrible and was returned and the second one makes the same noise (very slightly) and not as bad. I can live with the new ones sound but I'm picky as hell and may try a third one. I would like matching cooler on the cards , but I have been looking at the Zerotherma Gx815 since it looks very similar to the Duorb (duorb with one big orb if you will) and has a similar blue led. The Zerotherma doesn't cool as well and in crossfire these babys hit 67c to 70c, with the Duorb coolers, when clocked at 700/1150. The second Duorb I have now, kinda sound like a quiet hardrive spinning.