The whoosh will definitely be the cards, the stock coolers can be pretty loud. Clocked at 750mhz here, custom fan profile in afterburner. Keeps them at 70and 71c ono. I game using noise cancelling headphones so i rarely hear the fan noise. Id like to clock them higher, but i suspect id need a new psu. Seen too many horror stories of mobos being killed with 850w psu's and highly clocked 470's.Very pleased with them. Iv not overclocked the cards at all as i havent really felt the need to. Ingame theres a whoosh when there working hard but i cant decide if its from the cards or the PSU.